examples of pleats
Pleat: part of a garment folded over to form a double thickness of material.
top stitched pleat 
Pleat extending from a series of ornamental stitches on the outside of the fabric.
accordion pleat 
Set of thin upright pleats of uniform width along the grain of the fabric.
knife pleat 
Pleat created by a vertical fold pointing in one direction and of constant width.
kick pleat 
Inverted or flat back pleat at the bottom of a straight skirt, providing greater ease of movement.
inverted pleat 
Pleat formed by two folds that meet in front and touch on the outside of the fabric, thus forming a hollow in the fabric.