The Contrast Effect.
Normal, daily self: glasses, no makeup, no jewelry except my watch and one ring, pretty plain clothes like T-shirts and jeans
Dressed up self: contacts, some makeup, necklace and earrings, fitting (but not tight) dress for really fancy occasions, or maybe a nice top and jeans
The biggest difference? Mood. When I'm dressed up, I catch myself acting the part too, in little ways.