I had this serious problem after the suit was completed where the bottom of the bodysuit legs would ride up and remain bunched at the top of the foot. I can't stress enough how much I HATED this happening at RF. This is obviously due to the way I constructed it, but I couldn't make any alterations to the feet.
This is my solution: a loop of elastic sewn into the leg itself which loops between the two forward facing toes and under the foot. It works brilliantly and the leg remains a smooth digitigrade shape even under high amounts of activity.
No more adjusting my pant legs at cons! YAAAY!