Fashion in the 1920's was very outrageous and different to before this time period. Women started to dress bolder by showing more skin and men started to shy away from old styles into a more modern suit.
More on negative space, use it to show pattern, in 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.