The full figure does not always have to be drawn in and developed. When you need to focus on the ensemble itself, you can sketch just the outfit and accessories using the croquis under a sheet of tracing paper.
Developing the sense of proportion and harmonizing accessories
When you are exploring proportions, acceossories and the total look of an ensemble the full figure can be omitted from the sketch. Sometimes the only detail I add is a hairstyle. This initial sketch helps finalize the personality of an ensemble. From there a second sketch can be made, this time drawing in the figure and expression on the face. Remember, the croquis is a muse and flight of fancy. You are free to depict both as your imagination concieves of them.