About surface attachment

[iluvrachel]

Hey! I pretty like this impressive work. Thanks a lot.
But as I doing my own trials, I found that when some body parts touch together (e.g. hand on the hip), the PIFu mesh surface will stick. So the animation result is not good (even using mixamo auto-rig).
Do you consider about this issue? I am trying to find a solution and if you have any idea please let me know. Both manual method or automatic method are acceptable.