We'll try to use the current method of tracking the upper body with the camera, and make it applicable to the lower body as well.
Also, when the character moves out of the camera and tracking is no longer possible, what if we used the current AI correction and resumed tracking as soon as the character re-enters the camera's field of view?
With this method, we would still need to rely on AI for the waist, but being able to achieve full tracking without having to wear anything will be one of the attractions of the Quest.