I wore a skirt suit and felt feminine but very professional. At my interview last week, I think half of the girls were wearing skirt suits and half were wearing pants suits. I think the skirt suits look better 🙂 but that's just my opinion!
And definitely nude pantyhose. If you get a run (like I did right after my interview was done! eek haha) in your nylons, nude will be MUCH less obvious than black!