And converse shoes are the best. But, I really don't care about shoes otherwise. And if she doesn't like wearing heels, I'd prefer her not to wear heels. Really, I don't much like heels anyway. Why wear something that pains you to wear?
I don't know. I really don't care as long as it's not something way out there. Skirts, casual dresses. Jeans and the typical casual female shirt. Or just some random shirt. I don't really care. I don't actively see something a chick is wearing and go "Oh, that dress looks so amazing on her." My eyes tend to wander to other areas.
I like legs and feet on a girl, so the shortest shorts possible as well as heels or ideally barefoot is my favorite outfit on a girl. Lingerie is also nice but I would feel extremely uncomfortable around a girl in nothing but lingerie before we're married, since I'm traditional and don't believe in sex until then. My ideal girl would also belly dance, so a cute little belly dancer outfit is also my favorite.