"identical points in the face" and some "identical vertex index in face" - don't quite understand (so that must be it:)

But  you can still try with another cloth geometry (just to check) - if all goes fine than it means that that particular one is problematic.

edit:
"identical points in the face" - it means you have duplicated vertex in that obj. You coud try to clean this up with some modeling program - or change that figure one more time to an object.