I think the Nate Hair, shirt, & pants came from that huge topic about Normal and Occlusion Maps. Too big to give feedback there. I had taken those & put them on a Male muscle 13290 body with GAME_RIG. After moving the vertices to avoid conflicts of the body with pants & shirt, I reduced the vertices greatly to load better for WebGL using Limited dissolve delimeted by UV.
Hair- 10 degrees, boundaries No
Shirt- 3 degrees, boundaries Yes
Pants- 5 degrees, boundaries Yes
In WebGL, I had the character hunch a little & twist left. Parts of the Hair & Shirt had their own idea of what they were supposed to do. I am in the process of walking back where things got derailed. If anyone has a guess on where to start, please feel free to reply. I do not want to publish this mess yet, but here is a picture.