DG's costumes looked like what many college dance teams wear at competitions or performances...even their hair looked like a dance team's, which is why I asked if Ohio State had a dance team.
ETA: As for what southern college girls wear while dancing in public, I think if you look online you'll find evidence that they're not necessarily "classier" than others in what they wear and how they dance. Can't find any photos of Texas' dance team (if it has one), but here are some photos from the college dance championships last year (broadcast on ESPN) of other southern schools:
Memphis (first place):
http://www.varsity.com/nationals/07/...op/memphis.jpg
Alabama:
http://www.varsity.com/nationals/07/...op/alabama.jpg
Louisiana-L:
http://www.varsity.com/nationals/07/...-lafayette.jpg
LSU:
http://www.varsity.com/nationals/07/...sianastate.jpg
UCF (similar to Kappa's outfits):
http://www.varsity.com/nationals/07/...hiphop/ucf.jpg
Auburn:
http://www.varsity.com/nationals/07/...nce/auburn.jpg
Ole Miss:
http://www.varsity.com/nationals/07/...ississippi.jpg