cloth physics broken for robes, dresses and capes

Date & Time: 14.11.2014, somewhere around 9pm GMT +1
Frequency: sometimes, happened twice so far
World name: Zodiark
Character name: Jade Adair
Race: F Hyur, Midlander
Class/Level: Sage lvl 100
Party or solo: both
Steps:
1. start the windows version of the game
2. play a while
3. notice the robe getting stiff

After playing a while the physics of chestpieces stops working as usual. It is most noticable when the character jumps, since the butt and sometimes thighs clip through the layer of the chestpiece and become very visible.
When it occured the second time I tested a variety of outfits and notices that all longer chestpieces displayed the same faulty way, different bottoms, hands or shoes did not change the outcome.
The error stays even when changing location/instances, but is not visible to other players who are in the same instance.
Restarting the game fixes the issue temporarily, but it reoccurred after some time.

https://i.imgur.com/uUSp2V8.png
https://i.imgur.com/U5f45Di.png
https://i.imgur.com/8sxez05.png

For more info on replicating this issue, this happens when you're in the middle of casting a spell and your character gets knocked back by something.