A pleat in a piece of clothing is a permanent fold that is made in the cloth by folding one part over the other and sewing across the top end of the fold.
英汉词典释义
n.
(衣服上的)褶
She tacked the pleats down.她用粗针脚把褶子都缝住了。
英英词典释义
Noun
1. any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape