One of my favorite sketches: I analyze the draping, patterns, and styles of gowns of the famous designers (like this Elie Saab one). In this way, I can create my own designs inspired by their gorgeous gowns.
particular here, the pinstripes. Also note how the darker shadow of the leg and arm farthest away helps the eye see it farther back. Tone and negative space can liven up a fashion figure if you know where to place these two elements overall.