Work on the skin weights on a flat version of your cloak, then copy the weights to the thick version. Both sides should have identical topology, in case that's your problem.
If you dont want to deal with this mess you could cheat a bit have the cloak one sided and keep thickness only on the edges
If you want different color for top and bottom you could do that as shader effect
If you want to keep both sided I pretty sure that top and bottom verts dont have exact values[default transfer weights using distance as way of distribution check of there is different option like point to point ] thats why you got this issue so you have to find a way to fix that hopefully some script as manual will be nightmare
Your material seems to be rendering both sides of the inner surface.
How did you enable blackface culling? You can't just do it on view settings. There should be an option in the surface material for "2-sided" which should be disabled. If your material doesn't have this, you need to look for one that does, or else make your own custom shader.
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How did you enable blackface culling? You can't just do it on view settings. There should be an option in the surface material for "2-sided" which should be disabled. If your material doesn't have this, you need to look for one that does, or else make your own custom shader.