Topic While way and the fastener which stop the front median button of the slacks which have the structure of the front median button & fastener being attached in the west part are closed, or it can do foil thing with while you open, furthermore, when wearing, design of the west part flat offers the west structure which is the silhouette.SolutionsYou open the west part around one side side pocket, install the fastener, you feature that the expansion and contraction material is added inside. Choice figure Drawing 1
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