Is there a quick way to find what items I'm wearing so I can remove them easier?

Krin's been working on a wardrobe update that will have things like page numbers, possibly filters for have/have-nots (I can't remember for sure though)... so in the future hopefully things will be easier.

Your avatar's outfit looks like the typical "Clothes" stuff, which can't be removed (if you put on an item outfit and then remove it, the "Clothes" underneath will be revealed again". If you're looking to remove your shadowstalker, it's under Items --> Backs --> page 6, I think? (if I've counted correctly)

You're pretty new, so you probably don't have a lot of items yet... so in that case, you may be able to quickly flip through the pages and just keep a sharp eye out for the white background that indicates an item you own.