pleats means: Pleats can be described as a folded or doubled fabric piece that has been pressed, ironed, or creased. Tucks are pleats that have been sewn in place. Although there are many types, the most popular are the box and side pleats. They can also be circular, accordion or cartridge, as well as draped, Fortuny, French, French, French, cardinal, round, oval, French, piped, fluted or fluted. You can insert them or invert them. A skirt with pleats has a greater volume. The air vent from ‘The 7 Year Itch’ is a reference to Marilyn Monroe. (in Fashion Dictionary)