Honestly it really depends on the university though. Trust me, wearing a t shirt and shorts isn't being a "slob" or "slacker" at some schools, if the campus is huge. Girls still have perfect hair, expensive shoes, perfect makeup (it just looks natural), their john hart or brightly colored northface backpacks, little hair accessories, etc. along with their fancy sorority tees and brand new brightly colored shorts.......they just don't look crazy for wearing high heels and jeans with a nice top trying to hike all the way across 5 miles of campus in the 90 degree weather. Anyone who even tried that at my university would have been given the "stupid freshmen" look,as their feet probably wouldn't have even made it through the day and their nice shirts would get all nasty and sweaty from the heat. Girls can still look nice without dressing up necessarily like they did in high school, and keep the business casual in the closet for presentations. Other, smaller schools (like the private college my good friend went to) tend to have girls go all out with their appearance everyday though,nice heels and all, so "shorts and a tshirt" wouldn't be as acceptable. Again, I emphasize that it really,really depends on the school!