i think it takes a very naturally beautiful woman to not have to wear a stick of makeup.
I wear makeup everyday but i go for a natural look...lightly lined eyes, pink gloss, bronzer and some pink blush. I got for the beachy kind of look.
I think not wearing any makeup to work makes women look tired and unprofessional, especially under fluorescent lights. Unless you are angelina jolie, please wear some makeup to work.