Been reporting this for a long time now, but with the unvaulting coming soon I figured it might be worth trying again.
Oberon Prime's back tabard has an excessive cloth collision on the lower legs area. That makes it float away too much or get in between the legs in very weird ways:
Since it's pretty clear it won't collide under normal circumstances, I wonder if it's possible to reduce it a lot or even remove it. I don't really see the need for it in this case 😕