Something that I've gotten comments from that I wear: scarves (the silky ones, not the ones for warmth). I guess people my age (20s) aren't supposed to wear these or something? It might be a regional thing, but I just don't see it done. I don't know why, I don't care -- I think they're a fabulous way to make a solid color blouse interesting.
Another one that I'm not sure is a rule, but is something my mother told me not to do: I wear flats with skirts sometimes. I have some really cute Via Spiga flats, and I just can't help myself because a skirt is the best way to see them (as opposed to under a pant leg).
I never wear belts. I have at least 20 and they collect dust. I keep buying them with hopes that I will find one I like, but I end up hating all of them.
Luckily I'm curvy enough for my hips to catch my pants in the event my pants would ever shimmy downward