Hi,
It seems like there is an unreleased sprites .swf file of a clothing item with an id of 4901 (check image), though it doesn't seem like it has other swf files right now. Kinda reminds me a combination of some of the unlockable ninja items from the Treasure Book and the Doorman's Jacket.
The weird part is that it has the same ID as an unlockable version of the Goalie Jersey.
Anyway, if you may have some more information about this item, please create an article about it.