Use

The opening made in certain parts of garments which gives greater freedom in slipping them on. Skirts and petticoats, shirt sleeves, drawers and chemises, have these openings.

Fitness

The piece of material set on or folded over strengthens the garment where it has to bear a strain and is liable to be torn and the increased size of the opening gives comfort.

In full-sized garments the length of the placket depends on its use. The object should be merely to have the parts slip on easily and to avoid unnecessary length.