pleat means: Folds of fabric which are either sewn down or secured by another type of construction to control fullness. A group of pleats is usually formed. Pleats can be part of blouses, pants, and skirts. You can choose from many types of pleats. There are many types of pleats. (in Fashion Dictionary)

What else does pleat mean?

Fold in cloth by folding the material twice and pressing it or sewing it together. (in Merlin Dictionary)

Press or place pleats. (in Merlin Dictionary)