joining in!

i haven't tried anything with hard decorated groups, but i'm definitely interested in your solution.  my guess is that the issue is that vertice in the back.  is it part of the cloth or part of the hard decoration?  i can say that reading the manual (which, for a change, was useful), i solved a problem with a hem i had made soft decorated to keep from stretching.  it went right through the floor and i couldn't figure out why.  it turns out that if a decorated group shares vertices with the dynamic group, it doesn't handle collisiions properly.

Quote -
If the decorations group shares vertices with the cloth mesh, the decorations
vertices will not be simulated. This causes the simulator to treat these areas as
boundaries, resulting in increased movement of these areas compared to
neighboring regions of the cloth.

Welding accessories to the cloth mesh often creates a complex mesh where one
edge is shared by more than two polygons.

i think despite what people think, you're not supposed to attach decorated groups.