I didn't see a post anywhere that this was supposed to be this way, but I might have missed it (in which case lock the thread immediately). I went to add the item to my wardrobe and got this:

"Elegant Ballroom Coal Fur Shawl is not yet ready for the Avatar System :( Try again in a few days!"

The HA preview still works though? Was the item removed from the avatar system recently or is this an error?

Teal Feathered Dancing Wig is doing the same thing :(

I don't have the Teal Feathered Dancing Wig, but I tried on my Elegant Ballroom Coal Fur Shawl and it seems to be working fine. I'm fairly sure you can fix this by deleting your browser's cache and cookies :)

Please try the above tip! Also you may want to try and put it in your wardrobe through your inventory and quick stock.

I tried it again this morning (without deleting the cache and cookies) and it went through. For some reason it seems like it was some sort of randomly occurring error with items out of the Steamworks Menagerie during yesterday's host of other problems. Have no idea if it'll occur again, but it's rectified now. Thanks.

Ok! Glad it worked! I am going to locked this for now. If there are any other problems let me know and I can unlock this :)