Guys: how do you like your GF dressed up for a date?

Do you want her to look elegant like a princess? Or do you want her wearing formal office wear? Or is a jeans and t-shirt the dress of choice? What if she dresses up like a whore - midriff baring dress, skin tight bottoms that end well above the knee, etc? Remember, on the date you end up running into your ex or your parents or her parents. How would you like the impression to be?