Might as well necro this thread since I can't think of any other places to ask.
Been messing with the diaper model OP provided and it works surprisingly well. However, it looks like there's some sort of texture issue on the tapes. The left tape has a constant black shade over it and the right tape seems to have a checkerboard overlay of shade and transparent sheen (this is visible on the picture OP posted w/ Crystal from starfox as well). This is very noticeable when AO is active. This happens on very map/lighting setup I've tried.
Anyone better than me at SFM know what could be causing this? Is the model from OP bugged, or do I just suck at SFM?