Sometimes nice jeans, usually slacks or a skirt - always a nice nondescript shirt/blouse/sweater - ALWAYS freshly laundered (even the coat) and a little face.

I HATE seeing people looking like slobs (and some people, I wonder HOW the hell they manage to get out of the house!) and really mind my P's and Q's - I ask my travel companions to dress like they are going to a job interview...