Heya!

I was clearing TK25 with my mage team for the mount which never drops, and all I got was Mantle of the Elven Kings, which I later decided to use for transmog on mage A.
After the transmog, I saw the mantle was still tradeable (2 hours rule) so traded it to mage B, who used it for transmog and then transfered the item to mage C and so on..

Not sure if this was very well known stuff and common sense, but at least now my mages have similar shoulders and they're very happy now