I generally don't put a lot of attention into my clothing choices, except to match colors and that kind of junk. But I do know how to put an outfit together when necessary.
I have the same basic philosophy with make-up. Most of the time I don't wear it, unless I have some fancy event or I'm going out clubbing or something. I really don't like it. And I almost never wear mascara, because my eyelashes are already pretty thick (and actually, wearing mascara thins them out).
I have pale skin and dark hair, so when I go for make-up I usually go for cooler colors, like light pink, purple, etc.