A few things have been brought to my attention that are in the wardrobe and either aren't a wearable, or they are and there's no way to add them.
Most recent example - I never knew this was a wearable until my friend found it in the wardrobe (and it's SO CUTE omg) but there's no way to actually add it. (if you don't believe me, go check it out)
*note - really sorry if this is mentioned already - I didn't find anything that was newer than a year old when searching for the kitty, or that wasn't already locked, and this is just the latest thing brought up that I would REALLY LOVE to add to my wardrobe and WEAR.

Such a cute item to be wearable, shame we cannot add it!
there are a few items like that, that are not intended to be wearable and in fact have no overlay, but have somehow found their way into the wardrobe search nonetheless. some can be mistakenly added via quickstock, but they're really not supposed to actually end up in the wardrobe. i could have sworn there was already a thread for listing non-wearables in the wardrobe but i don't know where it is, if it ever even existed.