Thank you all for your advice!
As for where I'll store my stuff, like Scully, I already live out of my trunk.

I just didn't think my car would be an easy or fun place to get ready.
But I will definitely look into the locker rooms at the gym (because something tells me that a gym locker room will better suit my needs) and the bathrooms of those living on campus.
Thanks again!
@DubaiSis-we cross-posted, but you're right. I didn't think about my lipstick in my car (not to mention eyeliner and other melty items!). I'm going to call the Greek Life Office later today and see if they have any suggestions. This isn't a "commuter campus," but I KNOW I'm not the first one to commute to this school.