I also went with "clean up pretty." I'm lazy and slovenly about appearance if I know I'm not leaving the house for more than a trip to the grocery store. I own makeup, but I don't wear it very often because my husband dislikes heavily made-up women. (He even said when we started going out he liked my "fresh-faced" look.)
But if it's time for a more formal occasion, I'll put a little effort into it and come out very warm, if not hot.