Day 1: Open Houses: Everyone wore jean's and then the panhellenic greek shirt. It used to be the same one for every sorority but my senior year they personalized. So ours was green with a teddy bear on it while the KKGs was blue with a key, etc.
Day 2 & 3: Philantrophy Day: We wore jean skirts one year and black pants the next and with it we wore fitted black shirts with our letters embroidered on it in hot pink. They were really sharp but ran really small. I always wear a medium comfortably and it fit me like a corset...but they looked slimming...
Day 3: Skit: Black pants and usually a fun colorful dress shirt, although this past year I think they all wore black pants and white shirts. Plus any skit costumes.
Day 4: Pref: A black dress (that must be approved of course...not too much boobies) there were not real restrictions on jewelry but everyone knew to go low key. And shoes were black and formal, not hooker boots
Bid Day: Jeans and our bid day t-shirts.