This sounds interesting, so I might as well chime in too.
At my school dressing up is wearing a nice sweater, slacks, and make-up to class. Whenever you see a girl wearing a dress or a guy wearing a suit and tie, you know she or he must have an interview that day. At parties everyone dresses up, but it's still nothing more than black pants and a cute dressy top. (Of course we all wear dresses to formal chapters, but that's really another topic

.) It's really kind of funny how everyone here is so relaxed about that kind of stuff because the way we tell the difference between our university's students and people from somewhere else is by how they fix their hair, wear so much make-up, and expensive dressy clothes.