For a pleat, a certain area of a fabric is placed on top of or against each other, depending on the type. The most common types of pleats are the knife pleat, the box pleat or the crease pleat. The processing of a pleat also plays a role: pleats can retain width or add width by popping open. A well-known example is the pleated skirt.
Pleat types
Knife pleat
Crease pleat
Box pleat
Inverted pleat