Quote - That's interesting, rjjack. I may have to experiment with that approach. Which way do the "inside" polygons face? It's been my experience that the cloth simulation doesn't deal so well with collision from the way the polygons face - it's as if it's been biased to deal better with the inside of clothing, which is reasonable since that's the usual situation. I imagine the two layers would tend to collapse together during simulation, which may be why it doesn't give as much thickness as you'd expected.

the inner polygons face inside and yes the two layers collapse , the Collision Depth is for the object you can have many layers they will be more or less at the same distance from the collided object, IMO if some days we have a Collision Depth by dynamic group the multilayer approach can work