For legs and hips of the same color use entry 970c00.
For differently colored legs and hips use entries 970xABC where ABC is 3-digit LEGO Color ID of the hips.
For example, 970x026 - Legs and Black Hips.
Note the difference with Bricklink catalog where hips and legs are indexed by the color of the legs, e.g. 970c11 - 'Hips and Black Legs'.