In a pair of trousers stretchable around a waist, to be able to prevent from getting wrinkles and the like on upper parts of a front body and a back body with certainty and improve an appearance so as to make a tuck and an opening end of a storing part unnoticeable and yet, to be able to enhance its productivity.
In a pair of suit trousers 1, by following attachment of a tuck 5 to each of upper ends of side lines LS and RS, a primary elastic material being joined between an elongating part 3B and a storing part 3A becomes elastic, thereby being elastic around the waist. With this movement, tucks 5 are opened and closed, therefore, it can prevent from getting wrinkles and the like on upper parts of a front body 4 and a back body 9. Also, tucks 5 are attached along side lines LS and RS, thereby being united with side lines LS and RS with tucks 5 closed. Even if tucks 5 are opened, tucks 5 are extensions of side lines LS and RS, thereby being unnoticeable. Moreover, an opening end 3Ab of the storing part is attached along each of side lines LS and RS, thereby being recognized as a line which is an extension of each of side lines LS and RS and furthermore, belt loops 7 are attached thereto, thereby improving the appearance so as not to be noticeable.