Some old, some new, here's a list of every cosmetic we're still waiting to see in the item shop. As usual with leaks, none of these are confirmed and could simply never release. We're looking at you, gliders.
Note that there's also an outfit (and likely back bling) currently hidden in files that dataminers can't access, we won't know what it is until it releases.
These have been in the files for so long that we're not particularly convinced they'll ever come out. Either that or they were intended for a different version of the game. Just in case though, here they are: