Body parts
Fix which pixels move with which bone: pick a part, then paint or draw a border around it.
For an arm or leg, the border is its exact outline (everything else goes back to the body).
In side views (cyan = both legs overlap), mark a visible far foot as leg R and the near
leg as leg L (for the 0–180° frames) so each moves with its own leg.
Colors: head, torso,
arm L, arm R,
leg L, leg R,
front cloth, back cloth.