I came across the undressed tag while browsing around, and wonder if it's enough of a distinction from nude to bother with keeping undressed as a separate tag. It doesn't have any wiki description, and I don't see any practical way to differentiate the two.

There are currently 135 posts tagged undressed, but off the top of my head I don't know how many unique users are involved with that tagging. It's not outside the realm of possibility that someone was dedicated enough to have done all of the tags on their own, after all.

I may be missing something, though, so I'm asking for input from others.