Manufacturing method of size-free bra and size-free bra

Abstract

The invention provides a manufacturing method of a size-free bra and the size-free bra, which are used for realizing cross-size adaptation, comfortable wearing and effective shaping of the bra. The manufacturing method of the size-free bra comprises the following steps: acquiring breast data of user samples of various breast sizes; determining bra pattern data of the to-be-designed bra according to the chest data and contraction proportions of different areas of the to-be-designed bra; wherein the contraction proportions of different areas of the bra to be designed are different; according to the bra pattern data and the elasticity data of the fabrics adopted in different areas of the bra to be designed, predicting pressure information borne by different chest positions when user samples with different chest sizes wear the bra to be designed; the elasticity data indicates tension required for stretching in different degrees along a preset direction; and adjusting the contraction proportion and the bra pattern data according to the pressure information until the pressure range requirements of different chest positions are met.

Description

Technical Field

[0001] This disclosure relates to the field of textile processing technology, specifically to a method for manufacturing a size-free bra and the size-free bra itself. Background Technology

[0002] In recent years, with the upgrading of lingerie consumption demands, consumers have put forward higher requirements for the fit, comfort, and shaping of bras. However, the current lingerie market lacks unified bra manufacturing standards, and the craftsmanship, design, and sizing of different brands of lingerie vary significantly. This leads to frequent size confusion for consumers when purchasing bras, especially online. Even if people are of similar height and weight, they may choose the wrong cup or band size due to different brand specifications.

[0003] To solve the problem of sizing, size-free bras have emerged. With their flexible design, they can accommodate the needs of various body types, alleviating to some extent the frustration consumers face when choosing sizes online. However, existing size-free bras generally suffer from a trade-off between comfort and shaping. One type relies on highly elastic fabrics for a one-piece fit, but lacks effective physical support, making it difficult to withstand the weight of the breasts. This can lead to a loose, undefined bust shape, failing to meet consumers' needs for support and visual enhancement. Another type uses pressure to forcibly lift the breasts, which may temporarily create a firmer bust, but long-term wear can cause pressure on the chest cavity, leading to discomfort such as marks and chest tightness, thus deviating from the core purpose of size-free bras: comfort and liberation.

[0004] In short, existing size-free bras suffer from a design dilemma: high elasticity without support and low elasticity with strong compression, making it difficult to simultaneously meet the multiple needs of cross-size fit, comfortable wear, and effective shaping. Therefore, developing a size-free bra that can balance these performance characteristics through scientific design has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] In view of this, the present disclosure provides a method for manufacturing a size-free bra and a size-free bra, so as to achieve cross-size fitting, comfortable wearing and effective shaping of the bra.

[0006] In a first aspect, a method for manufacturing a size-free bra is provided, comprising: acquiring breast data of user samples with multiple breast sizes; determining bra pattern data for the bra to be designed based on the breast data and the shrinkage ratio for different areas of the bra; wherein the shrinkage ratio for different areas of the bra to be designed is different; predicting pressure information at different breast positions when user samples of different breast sizes wear the bra to be designed based on the bra pattern data and the elasticity data of the fabric used in different areas of the bra to be designed; the elasticity data indicating the tensile force required to stretch to different degrees along a preset direction; and adjusting the shrinkage ratio and the bra pattern data according to the pressure information until the pressure range requirements for different breast positions are met.

[0007] In one embodiment, the method further includes: determining the multidimensional attribute information of the fabric used in the different areas of the bra to be designed and the shrinkage ratio, based on the functional requirement information of the different areas.

[0008] In one embodiment, the different regions include a front sheet, a side sheet, and a back sheet, wherein the shrinkage ratio K1 of the front sheet is less than the shrinkage ratio K2 of the side sheet and the shrinkage ratio K3 of the back sheet.

[0009] In one embodiment, the shrinkage ratio K1 of the front sheet, the shrinkage ratio K2 of the side sheet, and the shrinkage ratio K3 of the back sheet satisfy the following conditions:

[0010] 0%≤K1<15%; K1 < K2 < 35%; K2 < K3 ≤ 50%.

[0011] In one embodiment, based on the bra pattern data and the elasticity data of the fabric used in different areas of the bra to be designed, the pressure information experienced by different breast positions when user samples of different breast sizes wear the bra to be designed is predicted. This includes: inputting the bra pattern data, breast data of user samples of various breast sizes, and the elasticity data into a pre-trained pressure prediction model, and predicting and outputting the pressure information experienced by different breast positions; the pressure prediction model is a multiple regression model for various pressure-influencing parameters; or, the pressure prediction model is a neural network model.

[0012] In one embodiment, when the pressure prediction model is a multiple regression model, the pressure prediction model is determined according to the following steps: constructing a multiple regression model based on multiple pressure influence parameters associated with the chest data and the elasticity data; and obtaining chest data of user samples of various chest sizes before and after wearing a reference bra, bra pattern data and elasticity data of the reference bra, and true pressure information of different chest positions of the user samples after wearing the reference bra; determining the parameter values ​​of the multiple pressure influence parameters based on the chest data of the user samples before and after wearing the reference bra, the bra pattern data and elasticity data of the reference bra; and substituting the parameter values ​​of the multiple pressure influence parameters into the multiple regression model, with the goal of minimizing the error information between the predicted pressure information of the multiple regression model and the true pressure information, fitting the regression coefficients of each pressure influence parameter in the multiple regression model.

[0013] In one embodiment, when the pressure prediction model is a neural network model, the pressure prediction model is trained according to the following steps: acquiring breast data of user samples of various breast sizes before and after wearing a reference bra, bra pattern data and elasticity data of the reference bra, and true pressure information of different breast positions of the user samples after wearing the reference bra; inputting the breast data of the user samples before and after wearing the reference bra, the bra pattern data and elasticity data of the reference bra into the neural network model to be trained to obtain predicted pressure information for different breast positions; adjusting the model parameters of the pressure prediction model according to the error information between the predicted pressure information and the true pressure information until the error information meets the preset conditions, thereby obtaining the trained pressure prediction model.

[0014] In one embodiment, the pressure truth information is determined according to the following steps: acquiring first pressure information of different breast positions when multiple user samples wear the reference bra, collected by pressure sensors, and second pressure information of different breast positions sensed by the multiple user samples; wherein there are multiple user samples for each breast size; and determining the pressure truth information of different breast positions for each breast size based on the first pressure information and the second pressure information.

[0015] In one embodiment, the bra pattern data, breast data of user samples with multiple breast sizes, and elastic data are input into a pre-trained pressure prediction model to predict and output pressure information at different breast positions. This includes: inputting the bra pattern data, breast data of user samples with multiple breast sizes, and elastic data into pressure prediction models corresponding to different breast positions to obtain pressure information output by the pressure prediction model for each breast position.

[0016] In one embodiment, determining the bra pattern data of the bra to be designed based on the breast data and the shrinkage ratio of different areas of the bra to be designed includes: determining the initial size information corresponding to different areas of the bra to be designed based on the breast data of user samples of multiple breast sizes; and determining the bra pattern data of the bra to be designed based on the initial size information corresponding to the different areas and the shrinkage ratio of different areas of the bra to be designed.

[0017] In one implementation, the initial size information corresponding to different areas of the bra to be designed is determined based on the breast data of user samples with multiple breast sizes. This includes: determining the size range that the different areas of the bra to be designed need to be adapted to based on the breast data of user samples with multiple breast sizes, and taking the median value of the size range as the initial size information; or, determining the weight value of each breast size based on the statistical information of the number of users covered by each breast size; and determining the initial size information based on the breast data corresponding to each breast size and the weight value.

[0018] Secondly, a size-free bra is provided, characterized in that it is manufactured using the method described in any of the above embodiments.

[0019] In one embodiment, the size-free bra includes a front panel, side panels, and a back panel. The two sides of the side panels are connected to the front panel and the back panel, respectively, and the top of the back panel is connected to the front panel. The front panel includes a cup and a support. The cup is used to wrap around and lift the user's breasts. The support is connected to the cup and the side panels to support the breasts.

[0020] In one embodiment, the bra cup includes a plurality of support portions, the plurality of support portions having different elastic stretch ratios along a first direction, wherein the elastic stretch ratio of the support portion farther from the target point is smaller; the target point is the position on the bra cup corresponding to the user's nipple; the first direction is a horizontal extension direction along the line connecting the left and right acromions.

[0021] The method for manufacturing a size-free bra provided in this disclosure is based on breast data from user samples of various breast sizes. It combines this data with the differentiated shrinkage ratios of different areas of the bra to determine the pattern data. The resulting bra can cover a range of breast shapes and sizes, avoiding the difficulty of selecting the right size for the same body type. Furthermore, by combining the bra pattern data, fabric elasticity data for different areas, and pressure prediction, the method accurately predicts the stress on different breast positions and adjusts the shrinkage ratio and pattern data to meet the required pressure range. This design logic enables precise pressure control, ensuring effective support and preventing breast sagging while limiting pressure within a comfortable threshold to avoid excessive compression. This satisfies both comfortable wear and precise shaping, addressing the performance imbalance problem of existing products. Moreover, this disclosure directly links the core parameters of bra design (such as shrinkage ratio, pattern data, and elasticity data) to the pressure effect, essentially basing pressure evaluation on objective data rather than subjective experience. This reduces the reliance on manual experience in bra manufacturing and improves product quality stability.

[0022] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this disclosure and, together with the specification, serve to explain the technical solutions of this disclosure. It should be understood that the following drawings only show some embodiments of this disclosure and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A flowchart illustrating a method for manufacturing a size-free bra according to an embodiment of this disclosure; Figure 2 A diagram illustrating the chest triangle area; Figure 3a This is a diagram showing the positions of the chest from the front. Figure 3b This is a diagram showing the positions of the chest on the back. Figure 4a This is a before-and-after illustration of wearing a size-free bra. Figure 4b This is a schematic diagram of the original breast shape of the user sample; Figure 4c A diagram illustrating the breast shape after wearing the size-free bra designed in this publication; Figure 5aA front structural schematic diagram of a size-free bra in a vest style provided for an exemplary embodiment of this disclosure; Figure 5b A schematic diagram of the back structure of a size-free bra provided as an exemplary embodiment of this disclosure; Figure 6a A front structural schematic diagram of a size-free bra style provided for an exemplary embodiment of this disclosure; Figure 6b A schematic diagram of the back structure of a size-free bra provided as an exemplary embodiment of this disclosure. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In this document, the term "and / or" merely describes a relationship, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0028] To address the technical pain points of existing size-free bras, such as inconsistent sizing, difficulty in balancing comfort and shaping, and poor product consistency due to reliance on manual experience in the manufacturing process, this invention proposes a data-driven, precisely optimized method for manufacturing size-free bras. This method is based on breast data from user samples of various breast sizes. It determines the initial bra pattern data by combining this data with the differentiated shrinkage ratios of different areas of the bra to be designed. Then, through collaborative analysis of the bra pattern data and the fabric elasticity data of each area, a pressure prediction model is used to accurately predict the stress on different breast positions. Finally, with the goal of meeting the preset pressure range, the shrinkage ratio and pattern data are iteratively adjusted to achieve the optimal balance between cross-size fit, comfortable wear, and effective shaping in size-free bras. The following detailed description of the technical solution of this disclosure, with reference to specific embodiments, further illustrates this method.

[0029] like Figure 1 As shown in the embodiments of this disclosure, the method for manufacturing a size-free bra includes the following steps: S101: Obtain chest data from user samples with multiple chest sizes.

[0030] Here, to provide basic data support for bra design that adapts to multiple body types and avoids the limitations of a single size, user samples covering different cup sizes (such as AC or AD cups) and band sizes (such as 70-85cm) can be selected, with at least 10 samples for each size. The collected breast data can include key breast parameters such as the user's bust circumference when not wearing clothing, bust point height, and chest triangle size, ensuring that the data comprehensively reflects the breast shape characteristics of different body types. Figure 2 As shown, the size of the chest triangle can include the distance between the user's chest points ( Figure 2 The distance represented by BC in the figure), and the first distance between the user's anterior neck point and right chest point ( Figure 2 The distance represented by AB in the figure), and the second distance between the user's anterior neck point and left chest point ( Figure 2 (The distance represented by AC in the diagram).

[0031] S102: Based on the breast data and the shrinkage ratio of different areas of the bra to be designed, determine the bra pattern data of the bra to be designed; wherein the shrinkage ratio of different areas of the bra to be designed is different.

[0032] Here, the bra to be designed can be divided into sections according to location and functional requirements. For example, it can include a front panel responsible for support and shaping, a side panel responsible for connection, fixation, and lateral shaping, and a back panel responsible for size fit and comfort adjustment. The front panel is the core area covering the front of the breast, extending from the center gore to the side panel joint. It is the key part that directly wraps and supports the breast. The front panel includes the cups and the support section. The cups conform to the breast, and the support section connects the cups and the side panels, forming a three-dimensional support structure. The front panel is used to wrap the breast, provide stable support, shape the breast, and prevent breast movement or sagging, while also accommodating different cup sizes. The side panels are located on both sides of the bra, with the left side connecting to the front panel and the right side connecting to the back panel, covering the area from the armpit to the lower side of the breast. The side panels are used to achieve a seamless connection between the front and back panels, providing lateral fixation to prevent accessory breast tissue from spilling out, while also accommodating different torso widths, balancing stability and fit. The back panel is located in the back area of ​​the bra, and its top is connected to the front panel (or shoulder strap). It surrounds the back at the horizontal position corresponding to the underbust circumference, forming a closed loop at the back. The back panel is used to adapt to different underbust sizes (such as 70-85cm) and back shapes, adapting to changes in circumference during human breathing and exercise, achieving a comfortable fit across sizes, while distributing the weight of the chest.

[0033] In practice, based on the multi-size breast data obtained from S101, the initial size of each area of ​​the bra can be determined. Then, different shrinkage ratios are set according to the functional requirements of each area (for example, a low shrinkage ratio is used for the front piece to ensure stable support, a high shrinkage ratio is used for the back piece to ensure elasticity, and a central shrinkage ratio is used for the side pieces to balance fixation and comfort). Through the calculation of the initial size and shrinkage ratio, the specific size data of the bra pattern for each area is finally obtained.

[0034] The shrinkage ratio described above represents the proportion by which the pattern size in the bra pattern data is reduced compared to the initial size. That is, shrinkage ratio = (initial size - pattern size) / initial size.

[0035] In practice, the multidimensional attribute information of the fabric used in different areas of the bra to be designed and the shrinkage ratio can be determined based on the functional requirements of different areas of the bra.

[0036] The functional requirements information indicates the bra functions performed by different areas of the bra. For example, the front panel (front center-side panel) is required to provide stable support and shaping, the side panel (side panel) is required to provide lateral fixation and support for underarm fat, and the back panel (back panel) is required to provide cross-size fit and comfortable adjustment.

[0037] The multidimensional properties of the fabric may include elasticity-related properties (such as elastic elongation, elastic modulus, etc.), support properties (characterizing the structural strength of the fabric itself or the support capacity enhanced by the process), skin feel-related properties (including the softness, smoothness, and skin-friendliness of the fabric (such as fiber composition and surface texture), breathability properties (such as the breathability and moisture wicking performance of the fabric), resilience properties (characterizing the ability of the fabric to return to its original shape after stretching), thickness and density properties, etc.

[0038] For example, for the front panel, which prioritizes support and shaping, a fabric with strong support and moderate elasticity (such as a slightly elastic fabric with gel / layering) can be selected. Since the front panel directly contacts the chest, a soft and smooth fabric (such as a nylon + spandex blend) is preferred. Because the cups in the front panel are prone to sweat accumulation, a breathable fabric (such as one with ventilation holes and thin molded cups) can be chosen. Additionally, a fabric with medium rebound can be selected for the front panel to conform to the chest shape with minimal rebound, avoiding excessive deformation. The support fabric in the front panel can be thicker to enhance support. For the back panel, which prioritizes size fit and comfortable adjustment, a skin-friendly fabric with high elasticity and good rebound (requiring rapid recovery after frequent stretching) (such as a nylon + spandex blend) can be selected. Since no additional support is needed, a low-support fabric can be chosen. Furthermore, the back panel requires medium to high breathability to avoid stuffiness. The thickness can be selected to be relatively thin to medium to reduce bulkiness. For side panels that require lateral fixation and support (lateral shaping) of the underarm fat, a skin-friendly fabric with medium elasticity and medium support can be selected.

[0039] Furthermore, fabric elasticity and shrinkage ratio are positively correlated: for the front panel, if the fabric selected based on functional requirements has low elasticity, the shrinkage ratio is the smallest; for the side panels, if the fabric selected based on functional requirements has medium elasticity, the shrinkage ratio is moderate; and for the back panel, if the fabric selected based on functional requirements has high elasticity, the shrinkage ratio is the largest. That is, the shrinkage ratio K1 of the front panel < the shrinkage ratio K2 of the side panels < the shrinkage ratio K3 of the back panel.

[0040] For example, the shrinkage ratio K1 of the front sheet, the shrinkage ratio K2 of the side sheet, and the shrinkage ratio K3 of the back sheet can satisfy the following conditions: 0%≤K1<15%; K1<K2<35%; K2<K3≤50%.

[0041] In one embodiment, determining the bra pattern data for the bra to be designed based on breast data and the shrinkage ratio for different areas of the bra to be designed may include: determining the initial size information corresponding to different areas of the bra to be designed based on breast data from user samples of multiple breast sizes; and determining the bra pattern data for the bra to be designed based on the initial size information corresponding to the different areas and the shrinkage ratio for different areas of the bra to be designed.

[0042] Here, the actual cutting size of the paper pattern is obtained by multiplying the initial size of each area by (1 - the shrinkage ratio of the corresponding area). For example, if the initial size of the front piece is 30cm and the shrinkage ratio is 10%, then the paper pattern size = 30 × (1 - 10%) = 27cm.

[0043] In a further implementation, when determining the initial size information corresponding to different areas of the bra to be designed based on the breast data of user samples with multiple breast sizes, one of the following methods can be adopted: (Method 1) Based on the breast data of user samples with multiple breast sizes, determine the size range that different areas of the bra to be designed need to be adapted to, and take the median value of the size range as the initial size information; or, (Method 2) Based on the statistical information of the number of users covered by multiple breast sizes, determine the weight value of each breast size; and determine the initial size information based on the breast data corresponding to each breast size and the weight value.

[0044] In Method 1 above, key anthropometric data corresponding to each area of ​​the bra (e.g., chest circumference for the front piece, back width for the back piece) are extracted from multi-size user sample data. The size coverage range of each area is determined (e.g., chest circumference coverage of 75-115 cm for the front piece, back width coverage of 32-36 cm for the back piece). The midpoint of the range is taken as the initial size (e.g., midpoint chest circumference 95 cm, midpoint back width 34 cm). This method is simple and direct, and can evenly cover different body types, avoiding bias towards any one extreme size.

[0045] In Method Two above, the percentage of users for each breast size (e.g., A cup, B cup, C cup) is used as the weight for that size (e.g., A cup 30%, B cup 40%, C cup 30%). Breast data for each size is extracted (e.g., A cup 85cm, B cup 90cm, C cup 95cm). The initial size is obtained by multiplying each size's data by its corresponding weight (e.g., 85×30%+90×40%+95×30%=90cm). This method highlights the needs of mainstream users, making the initial size more suitable for most body types and improving fit for the core customer group.

[0046] S103: Based on the bra pattern data and the elasticity data of the fabric used in different areas of the bra to be designed, predict the pressure information of different breast positions when user samples of different breast sizes wear the bra to be designed; the elasticity data indicates the tensile force required to stretch to different degrees along a preset direction.

[0047] Here, elasticity data determines the tension required for the fabric to stretch to different degrees along a predetermined direction (such as the left-right horizontal direction), which in turn affects the pressure on different breast positions when the user wears the bra. The dimensions of each area indicated by the bra pattern data, combined with the user sample's bust size, determine the stretch dimensions of each area after the user sample wears the bra to be designed. Based on these stretch dimensions and the tension required for different degrees of stretch indicated by the elasticity data, the pressure information experienced by different breast positions can be determined. As described above... Figure 2 ,as well as Figure 3a and Figure 3b As shown ( Figure 3a and Figure 3b Showing the breast positions from both the front and back views separately), different breast positions can include, for example, the side-to-upper position (…). Figure 3a The position represented by point P1 in the diagram), and the lower side ( Figure 3a and Figure 3b The position indicated by point P2 in the diagram), shoulder strap position ( Figure 2 , Figure 3a and Figure 3b The position represented by point P3 in the diagram), and the lower position after comparison ( Figure 3b (The position indicated by point P4 in the diagram). The upper side panel is the position covered by the upper edge of the side panel of the bra, the lower side panel is the position covered by the lower edge of the side panel of the bra, the shoulder strap position is the position covered by the top of the shoulder strap of the bra, and the lower back panel is the position covered by the lower back panel of the bra.

[0048] In one implementation, the bra pattern data, breast data of user samples with various breast sizes, and the elasticity data can be input into a pre-trained pressure prediction model to predict and output pressure information at different breast positions; the pressure prediction model is a multiple regression model for various pressure-affecting parameters; or, the pressure prediction model is a neural network model.

[0049] Here, a pressure prediction model is pre-trained. This model can be a multiple regression model, specifically a multiple linear regression model or a nonlinear regression model; alternatively, it can be a deep learning-based neural network model. After inputting the bra pattern data, fabric elasticity data for each region, and chest data from the user samples in S101 into the pre-trained pressure prediction model, the model will output pressure values ​​at different chest positions when worn by users of different sizes, providing a quantitative basis for subsequent optimization. In some embodiments, in addition to the bra pattern data, chest data, and elasticity data mentioned above, other data that may affect pressure can be input into the pressure prediction model, such as data related to user body shape factors, such as the user's height and weight.

[0050] For example, when the pressure prediction model is a multiple regression model, the pressure prediction model can be determined according to the following steps: Construct a multiple regression model based on multiple pressure-influencing parameters (such as underbust circumference, chest distance, fabric tensile strength, etc.) associated with the chest data and elasticity data of user samples of various chest sizes before and after wearing the reference bra; obtain the bra pattern data and elasticity data of the reference bra; and obtain the true pressure information of different chest positions of the user samples after wearing the reference bra (the true pressure information can be determined based on the pressure information uploaded by the user samples and / or the pressure information collected by pressure sensors); determine the parameter values ​​of the multiple pressure-influencing parameters based on the chest data of the user samples before and after wearing the reference bra, the bra pattern data and elasticity data of the reference bra; substitute the parameter values ​​of the multiple pressure-influencing parameters into the multiple regression model, aiming to minimize the error information between the predicted pressure information of the multiple regression model and the true pressure information, and fit the regression coefficients of each pressure-influencing parameter in the multiple regression model.

[0051] For example, the multiple regression model is a multiple restricted regression model, expressed as follows: P1 is the predicted pressure value, X k Here are the parameter values ​​for various pressure-affecting parameters, where 'a' is a constant pressure-affecting parameter, and 'b' is a constant pressure-affecting parameter. k For the corresponding X k The weighting coefficients.

[0052] For example, if the stress prediction model is a neural network model, the stress prediction model can be trained according to the following steps: Acquire breast data of user samples with various breast sizes before and after wearing a reference bra, bra pattern data and elasticity data of the reference bra, and true pressure information of different breast positions after the user samples wear the reference bra (this true pressure information can be determined based on pressure information uploaded by the user samples and / or pressure information collected by pressure sensors); input the breast data of the user samples before and after wearing the reference bra, the bra pattern data and elasticity data of the reference bra into a neural network model to be trained (which can be a unified model or different models corresponding to different breast positions) to obtain predicted pressure information for different breast positions; adjust the model parameters of the pressure prediction model according to the error information between the predicted pressure information and the true pressure information until the error information meets the preset conditions, thus obtaining the trained pressure prediction model.

[0053] In this implementation, a neural network model is trained to output pressure values ​​at different breast positions after the user wears the bra, based on the user's breast data, bra pattern, and elasticity data. This provides data support for personalized bra design and comfort optimization. The multi-dimensional data input to the model includes breast data (such as bust circumference and nipple spacing) before and after wearing the reference bra for various breast sizes, bra pattern dimensions (such as band width), elasticity data (such as tensile strength), and true pressure values ​​(determined by combining user feedback and / or sensor data). The collected multi-dimensional data is input into the neural network model to be trained (which can be designed as a uniform model or a dedicated model for different breast positions such as the upper side and shoulder strap positions). The model outputs predicted pressure information for the corresponding breast positions. Subsequently, by comparing the error between the model's predicted pressure and the actual pressure, the model parameters (such as weights and neuron connection coefficients) are adjusted. This prediction-comparison-parameter adjustment process is repeated until the error meets preset conditions (such as the error being less than a set threshold), resulting in a fully trained model.

[0054] In the specific implementation process, the true pressure information can be determined according to the following steps: The system acquires first pressure information (sensed by pressure sensors) and second pressure information (sensed by the same user samples at different breast positions) from multiple user samples wearing the reference bra. Multiple user samples are available for each breast size. Based on the first and second pressure information, the system determines the true pressure information for each breast size at different breast positions. For example, the system can weighted and summed the first and second pressure information to obtain the true pressure value for each user sample, and then average the true pressure values ​​from multiple user samples to obtain the final true pressure information.

[0055] The pressure prediction model mentioned above can be a unified model adapted to different breast positions. When using a unified pressure prediction model to predict pressure at different breast positions, the pressure prediction model can learn the differences in pressure characteristics at different positions to achieve simultaneous pressure prediction at multiple positions. After inputting bra pattern data, breast data of users with multiple sizes, and fabric elasticity data into the pressure prediction model, the pressure prediction outputs pressure information for different preset breast positions.

[0056] The aforementioned pressure prediction model can also be a pressure prediction model corresponding to each breast position. In this case, the bra pattern data, breast data of user samples with multiple breast sizes, and the elasticity data are input into the pressure prediction models corresponding to different breast positions to obtain the pressure information output by the pressure prediction models corresponding to each breast position. In this implementation, an independent model is trained for each preset breast position (such as the upper side panel, the lower back panel, etc.), and each model specifically learns the pressure influence law of the corresponding position (such as the upper side panel being more significantly affected by the width of the pattern's underbust band and the fabric's tensile strength). The same input data (including bra pattern, breast data, and elasticity data) are input into the dedicated models for each position, and each model only outputs the pressure information of the corresponding position. This method has relatively higher accuracy and can specifically adapt to the functional needs of each position (such as the side panel needing to prevent accessory breast tissue, and the pressure prediction focusing more on lateral force).

[0057] S104: Adjust the shrinkage ratio and the bra pattern data according to the pressure information until the pressure range requirements of different breast positions are met.

[0058] Here, by pre-setting reasonable pressure ranges for each chest position (the minimum pressure is a value greater than 0 to ensure support, and the maximum pressure does not exceed the preset comfort threshold), if the pressure predicted by S103 exceeds the range, targeted adjustments are made. For example, if the pressure is too high, the elasticity of the fabric in the corresponding area is increased and the shrinkage ratio is increased accordingly or the pattern size is optimized. If the pressure is too low, the elasticity of the fabric in the corresponding area is reduced and the shrinkage ratio is reduced accordingly or the pattern structure is adjusted. The prediction-adjustment process is repeated until the pressure at the key chest positions of all sizes meets the preset requirements.

[0059] In practice, different chest positions experience different pressures. Generally, the pressure is slightly higher in the supporting areas (such as the lower side panel and the lower edge of the chest) and slightly lower in the fitting areas (such as the back panel and the center gore). Therefore, different comfort thresholds can be set for different chest positions (the specific settings can be based on the wearing experience of the user sample). By checking the predicted pressure at each key chest location (such as upper lateral, lower lateral, shoulder girdle, and lower posterior), it is determined whether the predicted pressure is within the preset range (e.g., the preset range for upper lateral pressure is 1.2 kPa - 3.1 kPa, for the shoulder girdle pressure is 1.20 kPa - 3.90 kPa, and for the lower lateral pressure is 1.20 kPa - 3.10 kPa). In other words, is there a situation where the pressure is excessive (causing compression): predicted pressure > preset maximum value (e.g., shoulder girdle pressure 4.2 kPa > 3.90 kPa), or insufficient pressure (resulting in insufficient support): predicted pressure < preset minimum value (e.g., lower lateral pressure 0.5 kPa < 1.20 kPa). If the pressure does not meet the pressure range requirements for different chest locations, adjustments are made to the contraction ratio and pattern data.

[0060] For example, if pressure exceeds the limit, the fabric elasticity in the corresponding area can be increased, the shrinkage ratio increased, and the pattern size reduced further (provided the fabric elasticity is sufficient). The relevant width dimensions in the pattern data can also be widened. Here, the shrinkage ratio gradient is linked to the fabric elasticity gradient; increasing elasticity reduces localized pressure, while increasing the shrinkage ratio allows for greater stretching space. For instance, if pressure is excessive in the upper side panel, the shrinkage ratio of the side panel can be adjusted from 25% (allowing for 25% stretching space) to 30% (allowing for 30% stretching space), and a more elastic fabric can be used to distribute pressure during stretching, reducing localized pressure. Another example: if pressure is excessive in the shoulder strap area, the shoulder strap width in the pattern data can be increased (e.g., from 1cm to 1.5cm) to expand the stress area, thus reducing pressure per unit area. If pressure is excessive in the lower side panel area, the bottom width of the side panel pattern can be increased to provide a looser fit to the chest, distributing pressure.

[0061] Accordingly, when pressure is insufficient, the fabric elasticity in the corresponding area can be reduced, the shrinkage ratio can be decreased, and the shrinkage of the pattern size can be reduced. Furthermore, relevant dimensions in the pattern data can be optimized. For example, if the cup support is insufficient, the arc length of the lower edge of the cup can be increased (e.g., from 23.3cm to 24.5cm) to increase the coverage area of ​​the lower edge of the breast and enhance support pressure. Another example is if the back band fit is insufficient (uneven pressure for some users), the back band unfolding length can be adjusted to optimize cross-size fit in conjunction with the shrinkage ratio.

[0062] As shown in 4a, this is a diagram illustrating the effect before and after wearing a size-free bra. Figure 4b The original breast shape of the user sample. Figure 4c This is a schematic diagram of the breast shape after wearing the size-free bra designed in this disclosure. It can be seen that the size-free bra of this disclosure has excellent shaping function. Through the size-free bra involved in this disclosure, the user's breasts can be reshaped into a "push-up & push-in" shape (i.e., upward lifting + inward gathering). In the naked state, L2 is longer (breasts naturally sag, bust point (BP) position is lower), and L1 is shorter (breasts are spread out, the distance between the inner and outer edges is small). After shaping (bra wearing state), L2 shortens (BP is lifted upward, the vertical height of the breasts decreases), and L1 increases (the arc length from inner→BP→outer becomes longer, the breasts gather inward, avoiding outward expansion).

[0063] like Figure 5a and Figure 5b The diagram shown is a schematic representation of a vest-style sizeless bra provided in an exemplary embodiment of this disclosure, wherein... Figure 5a This is a schematic diagram of the front structure. Figure 5b This is a schematic diagram of the rear structure; as shown. Figure 6a and Figure 6b The diagram shown is a schematic representation of a size-free bra style provided in an exemplary embodiment of this disclosure, wherein... Figure 6a This is a schematic diagram of the front structure. Figure 6b This is a schematic diagram of the back structure. The sizeless bra provided in this embodiment includes a front panel 1, a back panel 2, and a side panel 3. The two sides of the side panel 3 are respectively connected to the front panel 1 and the back panel 2, and the top of the back panel 2 is connected to the front panel 1. The front panel 1 includes a cup portion 11 and a support portion 12; the cup portion 11 is used to wrap around and lift the user's breasts; the support portion 12 is connected to the cup portion 11 and the side panel 3 respectively, and is used to support the breasts.

[0064] The aforementioned front panel 1 provides protection and support to the user's breasts by wrapping and supporting them. The cup portion 11 of the front panel 1 directly contacts the breasts, serving to wrap and lift them. All or part of the cup portion 11 may have an elastic structure; for example, all or part of the cup portion 11 may contain elastic fabric. Thus, when the user wears the bra, especially when the user has a fuller bust, the cup portion 11 can stretch along a first direction (the horizontal extension along the line connecting the left and right acromions) to adapt to the user's breast shape. In this embodiment, the cup portion 11 on each side of the bra can be stretched by more than 2.5 cm along the first direction, therefore both sides can be stretched by 5 cm. Thus, the bra provided in this embodiment can accommodate at least three different cup sizes (e.g., A cup, B cup, C cup). The support portion 12 connects the cup portion 11 and the side panel 3. The main function of the support portion 12 is to provide additional support and stability to the user's breasts, preventing sagging or swaying during activity. In this embodiment of the disclosure, part or all of the support portion 12 may include a low-elasticity material (e.g., non-elastic or slightly elastic shaping yarn, adhesive, film, etc.).

[0065] Side panels 3 are located on both sides of the bra, connecting the front panel 1 and the back panel 2. Side panels 3 provide lateral support, helping to lift and center the user's breasts forward while enhancing overall stability. The stretch ratio of side panels 3 is greater than that of the front panel, and correspondingly, its elastic stretch ratio is about twice that of the front panel 1, allowing for better adaptation to different body types.

[0066] When a user wears the bra, their back comes into contact with the back panel 2. The top of the back panel 2 connects to the front panel 1, providing back support and distributing the weight of the user's chest in conjunction with the shoulder straps 13. The elastic stretch ratio of the back panel 2 along the first direction is higher than that of the side panel 3, and can be up to three times that of the front panel 1, thus adapting to different body shapes and back lengths, resulting in a good overall fit and comfort for users of different body types.

[0067] Consistent with the trend of the stretch ratio, the elastic stretch ratio of the front piece 1, the side piece 3, and the back piece 2 of the sizeless three-dimensional gradient bra provided in this embodiment increases sequentially.

[0068] Specifically, the front panel 1 has the smallest overall elastic stretch ratio, or average elastic stretch ratio, along the first direction, to better wrap and support the breasts. The side panel 3 has a larger overall elastic stretch ratio than the front panel 1 but smaller than the back panel 2. The back panel 2 has the largest elastic stretch ratio. In this way, through the differentiated elastic design of different parts of the bra, the bra can adapt to different body shapes and sizes, improve wearing comfort, and to some extent enhance the shape of the breasts.

[0069] In one embodiment, the cup portion 11 may include a three-dimensional molded cup. This three-dimensional molded cup may be molded from elastic fabric. When the user wears the bra, the bra is in a stretched state, and the cup can simultaneously accommodate A-cup, B-cup, and C-cup measurements.

[0070] In one embodiment, during bra manufacturing, the shrinkage ratio of the support portion 12 is less than the stretching ratio of the cup portion 11; correspondingly, when the support portion 12 and the cup portion 11 are stretched along the first direction, the elastic stretching ratio of the support portion 12 is less than the elastic stretching ratio of the cup portion 11.

[0071] In this embodiment, the overall elastic elongation ratio of the support portion 12 can be less than the overall elastic elongation ratio of the cup portion 11. For example, the entire area of ​​the support portion 12 is provided with denser dots of adhesive (…). Figure 5a (As shown by the black dots in / 5b / 6a / 6b), this results in a relatively low overall elastic stretch ratio for the support section. This makes the overall structure of the bra more stable, providing effective support for the breasts. The majority of the cup section 11 is made of elastic material, resulting in a relatively high overall elastic stretch ratio for the cup section 11. This not only allows the bra to adapt to users of different body types and sizes, providing good coverage and fit, but also better shapes the breasts, enhancing the wearing effect, for example, as... Figure 2 As shown, the distance between the chest points (BC) is about 2cm smaller when dressed than when naked, and the first distance between the front neck point and the right chest point (AB) and the second distance between the front neck point and the left chest point (AC) are about 1.25cm smaller when dressed than when naked.

[0072] In one embodiment, the cup portion 11 may include a plurality of support portions below the target point, the support portions being used to support the user's breasts, the plurality of support portions having different elastic stretch ratios along a first direction, wherein the elastic stretch ratio of the support portion farther from the target point in a second direction is smaller; the target point is the position on the cup portion corresponding to the user's nipple; the first direction is a horizontal extension direction along the line connecting the left and right acromions, and the second direction is the direction of gravity.

[0073] like Figure 5a and Figure 6a As shown, the target point φ of the bra cup 11 corresponds to the user's nipple. Below the target point φ are multiple support portions, each with a different elastic stretch ratio along the first direction. The division of the support portions can be set according to actual needs. For example, as... Figure 5a and Figure 6a As shown, the target point of the bra cup includes two support portions. Among them, a first support portion is provided along the edge of the bra cup and connected to the support portion. Figure 5a and Figure 6aThe area filled with a black flame-shaped icon) and the second support located above the first support ( Figure 5a and Figure 6a (The white area located below the target point). The elastic stretch ratio of the first support part along the first direction is smaller than that of the second support part.

[0074] Of course, in some embodiments, the cup portion may also include two or more support portions. The elastic stretch ratio of each support portion along the first direction may be different. In the second direction, the support portion closer to the target point has a larger elastic stretch ratio, and the support portion farther from the target point has a smaller elastic stretch ratio. That is, starting from the support portion below the target point corresponding to the nipple, upwards (along the height of the human body) to each support portion of the cup portion, as the distance from the target point gradually decreases, the elastic stretch ratio of the support portion in the first direction shows a gradual increasing trend. In this way, the support portion and the various support segments below the cup portion present different three-dimensional support transitions, with the support decreasing towards the target point. This not only achieves effective support for the breasts but also allows the cup portion to effectively wrap around breasts of different volumes, such as simultaneously accommodating A cup, B cup, and C cup.

[0075] In some embodiments, the support portion at the lower edge of the cup portion 11 of the sizeless bra can also reduce the elastic stretch ratio of this portion using a dotting or gel adhesive process. The density of the dotting area in this region is less than the density of the dotting area in the support portion 12, so the elastic stretch ratio of the support portion can be slightly greater than that of the support portion. Due to the effect of the dotting area, the fabric deformation of the support portion is small when the user wears the bra, increasing the support force on the bottom of the breast, thereby effectively supporting the weight of the breast. The support portion located above the dotting area (the white filling area below the target point) can maintain the elasticity of the fabric itself (not restricted by the dotting area below, the fabric can be stretched). For example, as mentioned above, the cup portion may include an elastic molded cup, which is molded into a certain three-dimensional space and superimposed with relatively high fabric elasticity, so as to comfortably wrap different breast volumes (A cup, B cup, C cup). That is, the elastic stretch ratio of different portions of the sizeless bra provided in this embodiment gradually increases from the underband upwards to the target point, and the support force and lifting force on the breast gradually decrease from large to small. The area of ​​the cup corresponding to the nipple utilizes the fabric's good elasticity and resilience, allowing the cup to accommodate different breast sizes. It can easily cover the size of an AC cup and quickly recover after deformation, thus providing a comfortable and flexible fit for different breast sizes.

[0076] In one embodiment, the support portion 12 is provided with reinforcing ribs, wherein the reinforcing ribs include at least one of adhesive film, adhesive dots, jelly adhesive, and lining strips. The reinforcing ribs can increase the elastic recovery ratio of the support portion, making the portion less prone to stretching, thereby providing more effective support for the chest. The reinforcing ribs can include at least one of adhesive film, adhesive dots, jelly adhesive, and lining strips. Taking adhesive film as an example, the adhesive film can include adhesive film patches, and the shape, thickness, and adhesion position of the adhesive film can be arbitrarily set according to actual needs, including but not limited to square, circular, elliptical, or irregular shapes. The bonding effect between the adhesive film and the fabric, as well as the overall elastic stretch ratio of the support portion, can be evaluated in advance through tensile tests and adhesive strength tests, ensuring that the adhesive film does not detach or break during stretching.

[0077] For example, the entire sizeless bra can be made of the same or similar elastic fabric, while the support section can have its elastic stretch ratio changed by adding reinforcing ribs. By adding reinforcing ribs to the support section to change its elastic stretch ratio, this method not only reduces production costs and simplifies the production process, but also achieves differentiated elasticity, enhances support, improves fit, and simultaneously improves wearing comfort and a uniformly varied texture.

[0078] In one embodiment, the plurality of support portions are provided with reinforcing ribs, and the properties of the reinforcing ribs in different support portions may be different. The reinforcing ribs include at least one of an adhesive film, adhesive dots, jelly adhesive, and a lining strip, wherein the properties of the adhesive film include the type, thickness, and spandex content of the adhesive film; the properties of the adhesive dots include the dot diameter and dot density; the properties of the jelly adhesive include the shape, size, and spacing of the jelly adhesive; and the properties of the lining strip include the elasticity of the lining strip.

[0079] In one example, the support portion of the bra cup can be provided with a film. The thickness of the film varies in different support portions. The support portion closer to the target point can be provided with a thinner film (or no film), while the support portion farther from the target point can be provided with a thicker film, thereby achieving a differentiated design of the elastic stretch ratio of different support portions.

[0080] In another example, the elastic stretch ratio of the support portion of the cup can be adjusted by dispensing adhesive. The dispensing density of different support portions can be different; the dispensing density of the support portion closer to the target point can be less than that of the support portion farther from the target point, thereby achieving a differentiated design of the elastic stretch ratio of different support portions.

[0081] In one implementation, such as Figure 5aAs shown in / 5b / 6a / 6b, the cup portion 11 includes a support and lifting area 111, which is connected to the support portion 12 and is used to support and lift the user's breasts. The inner or middle layer of the support and lifting area 111 is provided with reinforcing ribs. The reinforcing ribs of the front-middle lifting section 1111, the side shaping section 1113, and the bottom support section 1112 of the support and lifting area 111 have different properties, causing the elastic stretch ratio of the front-middle lifting section 1111, the side shaping section 1113, and the bottom support section 1112 to decrease sequentially along the first direction. The reinforcing ribs include at least one of an adhesive film, adhesive dots, jelly adhesive, and a lining strip. The properties of the adhesive film include the type, thickness, and spandex content of the adhesive film. The properties of the adhesive dots include the dot diameter and dot density. The properties of the jelly adhesive include the shape, size, and spacing of the jelly adhesive. The properties of the lining strip include the elasticity of the lining strip.

[0082] Different areas of the support and lifting zone 111 located at the edge of the bra cup can achieve differentiated elasticity designs by setting reinforcing ribs with different properties. For example, the small flame area in the diagram represents the gel-like material area. The larger and denser the shape of the gel-like material area, the smaller the elastic stretch ratio of that area, and the greater the support and lifting force. The gel-like material areas can be set at intervals, and the fabric between adjacent gel-like material areas can still maintain good elasticity and can be stretched relatively easily.

[0083] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

[0084] Finally, it should be noted that the above-described embodiments are merely specific implementations of this disclosure, used to illustrate the technical solutions of this disclosure, and not to limit it. The protection scope of this disclosure is not limited thereto. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this disclosure; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure, and should all be covered within the protection scope of this disclosure. Therefore, the protection scope of this disclosure should be determined by the protection scope of the claims.

Claims

1. A method for manufacturing a size-free bra, characterized in that, include: Obtain breast data from user samples with multiple breast sizes; Based on the chest data and the shrinkage ratio of different areas of the bra to be designed, the bra pattern data of the bra to be designed is determined; wherein, the shrinkage ratio of different areas of the bra to be designed is different; Based on the bra pattern data and the elasticity data of the fabric used in different areas of the bra to be designed, the pressure information of different breast positions when user samples of different breast sizes wear the bra to be designed is predicted; the elasticity data indicates the tensile force required to stretch to different degrees along a preset direction; Adjust the shrinkage ratio and the bra pattern data according to the pressure information until the pressure range requirements for different breast positions are met.

2. The method according to claim 1, characterized in that, The method further includes: Based on the functional requirements of different areas of the bra to be designed, the multidimensional attribute information of the fabric used in each of the different areas and the shrinkage ratio are determined.

3. The method according to claim 1, characterized in that, The different regions include a front sheet, a side sheet, and a back sheet, wherein the shrinkage ratio K1 of the front sheet is less than the shrinkage ratio K2 of the side sheet and the shrinkage ratio K3 of the back sheet.

4. The method according to claim 3, characterized in that, The shrinkage ratio K1 of the front sheet, the shrinkage ratio K2 of the side sheet, and the shrinkage ratio K3 of the back sheet satisfy the following conditions: 0%≤K1＜15％； K1 < K2 < 35%; K2 < K3 ≤ 50%.

5. The method according to claim 1, characterized in that, Based on the bra pattern data and the elasticity data of the fabric used in different areas of the bra to be designed, predict the pressure information experienced by different breast positions when user samples of different breast sizes wear the bra to be designed, including: The bra pattern data, breast data of user samples with various breast sizes, and elasticity data are input into a pre-trained pressure prediction model to predict and output pressure information at different breast positions. The pressure prediction model is a multiple regression model for various pressure-affecting parameters; or, the pressure prediction model is a neural network model.

6. The method according to claim 5, characterized in that, When the stress prediction model is a multiple regression model, the stress prediction model is determined according to the following steps: A multivariate regression model is constructed based on various pressure influence parameters associated with the chest data and the elasticity data; and, chest data of user samples with various chest sizes before and after wearing the reference bra, bra pattern data and elasticity data of the reference bra, and true pressure information of different chest positions of the user samples after wearing the reference bra are obtained. Based on the breast data of the user sample before and after wearing the reference bra, the bra pattern data and elasticity data of the reference bra, the parameter values ​​of the various pressure influence parameters are determined; The parameter values ​​of the various pressure-affecting parameters are substituted into the multiple regression model. With the goal of minimizing the error information between the predicted pressure information and the true pressure information of the multiple regression model, the regression coefficients of each pressure-affecting parameter in the multiple regression model are obtained by fitting.

7. The method according to claim 5, characterized in that, When the stress prediction model is a neural network model, the stress prediction model is trained according to the following steps: Acquire breast data of user samples with multiple breast sizes before and after wearing a reference bra, bra pattern data and elasticity data of the reference bra, and true pressure information of different breast positions of the user samples after wearing the reference bra; The user sample's breast data before and after wearing the reference bra, the bra pattern data and elasticity data of the reference bra are input into the neural network model to be trained to obtain the predicted pressure information for different breast positions. Based on the error information between the predicted pressure information and the true pressure information, the model parameters of the pressure prediction model are adjusted until the error information meets the preset conditions, thus obtaining the trained pressure prediction model.

8. The method according to claim 6 or 7, characterized in that, The pressure truth information is determined according to the following steps: The system acquires first pressure information from multiple user samples wearing the reference bra, as well as second pressure information from the multiple user samples at different breast positions, collected by pressure sensors; wherein there are multiple user samples for each breast size. Based on the first pressure information and the second pressure information, determine the true pressure information of different chest positions for each chest size.

9. The method according to claim 5, characterized in that, The bra pattern data, breast data from user samples of various breast sizes, and the elasticity data are input into a pre-trained pressure prediction model to predict and output pressure information at different breast positions, including: The bra pattern data, breast data of user samples with various breast sizes, and elasticity data are input into pressure prediction models corresponding to different breast positions to obtain pressure information output by the pressure prediction model for each breast position.

10. The method according to claim 1, characterized in that, Based on the breast data and the shrinkage ratio for different areas of the bra to be designed, the bra pattern data for the bra to be designed is determined, including: Based on the chest data of user samples with various chest sizes, the initial size information corresponding to different areas of the bra to be designed is determined. Based on the initial size information corresponding to the different regions, and the shrinkage ratio of the different regions of the bra to be designed, the bra pattern data of the bra to be designed is determined.

11. The method according to claim 10, characterized in that, Based on breast data from user samples of various breast sizes, the initial size information corresponding to different areas of the bra to be designed is determined, including: Based on breast data from user samples of various breast sizes, the required size range for different areas of the bra to be designed is determined, and the median value of the size range is taken as the initial size information; or... Based on the statistical information of the number of users covered by various chest sizes, a weight value for each chest size is determined; based on the chest data corresponding to each chest size and the weight value, the initial size information is determined.

12. A size-free bra, characterized in that, It is prepared using the method described in any one of claims 1 to 11.

13. The size-free bra according to claim 12, characterized in that, The size-free bra includes a front panel, side panels, and a back panel. The two sides of the side panels are connected to the front panel and the back panel, respectively, and the top of the back panel is connected to the front panel. The front panel includes a cup portion and a support portion; the cup portion is used to wrap around and lift the user's breasts; the support portion is connected to the cup portion and the side panel portion respectively, and is used to support the breasts.

14. The size-free bra according to claim 13, characterized in that, The bra cup includes multiple support portions, and the multiple support portions have different elastic stretch ratios along a first direction. The elastic stretch ratio of the support portion farther away from the target point in a second direction is smaller. The target point is the position on the bra cup corresponding to the user's nipple. The first direction is a horizontal extension direction along the line connecting the left and right acromions, and the second direction is the direction of gravity.

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