A big canvas you can cover
The front and outer thigh give one of the largest areas outside the back, and shorts or a skirt decide when it shows. Large florals, Japanese pieces and long vertical designs fit naturally from the hip toward the knee.
The skin is soft and changes with muscle and weight more than the arm does, so very fine geometric lines can drift out of true over time. Bolder outlines hold their shape better.
Fitting it in the editor
Photograph the leg side-on or from the front, standing relaxed. Thigh designs open in Wrap: keep Wrap strength low, as the thigh is wide, and line long designs up with the leg.