One of the first things modders do when a new game comes out is figure out how to swap the vanilla body for something better suited to their tastes. This naturally leads to a variety of shapes and figures, with clothes and armor to match. I, personally, would find it very useful to be able to tag search on, say, "vanilla bodies" and only bring up clothes and armor that can be used without a body replacer, or to choose a popular body mod and only find what goes with that, without wasting time on stuff that doesn't qualify. Why not just do a regular search, you ask? Because that's not very reliable, as vanilla outfits (in my experience) rarely include the word "vanilla" in their descriptions. Likewise, if I want to find a Type 3 (Or whatever) searching on "Type 3" is perfectly capable of bringing up items that "...will never build a Type 3 version, not no way, not no how". A tag for these would reduce the false positives and misses drastically. This is an issue I've notice with the Nexus pages I've used (Both Fallouts, Oblivion, Skyrim) and while it's far from being a deal breaker, it *would* make life a lot easier.