Also, it might depend on where you are doing the Recruitment parties. For example, at UGA, you would be walking from house to house, but at West Georgia (I think Rec. is Labor Day weekend), the parties are held in the 1 sorority dorm/1 class building for Pref so you are just walking from hall to hall..of course, that doesn't count waiting outside in the heat/rain waiting to get in, lol!
Just be yourself and wear what you will be comfortable in..especially shoes! It's hard to keep smiling if your feet are killing you!
Your Rho Chi will be the best person(s) to ask..they've done it before on your campus!