|Semantics of line drawings|
This is a special case of my previous slide. Artists often emphasise creases in clothing, to add information about the shape of the body and what the person is doing and feeling. A lot of the lines on the skirts below are rims, where the surface of the skirt grazes the line of sight.
From Adrian Porter, The Perfect Debutante, 1937. Drawings by Eileen McGrath.