As you can see there doesn’t appear to be any weights paints from either the lower or upper parts onto the sleeve or from the sleeve onto the lower part…now I can’t say if those weights aren’t somehow getting screwed up while being imported into Unreal…It’s a remote possibility…
I tried using iClone Live Link for Unreal where it plays the Animation in iClone and mirrors it in Unreal and I did not in fact get those issues with the Physics…So it’s possible that exporting it from CC3 and importing it into Unreal may be some how messing it up…
maybe one of the import settings…I played around with them a bit but not extensively.