Awww, cute shoes. I have to second all the advice on getting to know what's okay on your campus and what's not. I would avoid leggings on the dressier days if I were you. Look, if you wear those things to the gym, I don't want to SEE that nonsense on pref day! They're way too casual. Sundresses are good, just as long as you're not a winter recruitment.

Same goes with white shoes--you couldn't pay me to wear those things after Labor Day, and if you're in the South, a lot of your rushers are going to have the same thoughts on said subject. Just be mindful of the time of year. I'm guessing you're a Fall recruitment? And it's going to be hot and humid? Your shorts and flats outfit sounds really cute and great for icky hot days. Sundresses like Lilly and the like are also really good because they're easy to wear, so if you can pull that off for a day, I would. Be cute but modest, though. Make sure your pants won't ride down when you sit, make sure your dress stays in place without a lot of adjustment, etc., etc. Realize that you're going to be moving, standing, sitting, and everything--a lot. The most important thing to look for would be clothes that will move with you!