I went to EMU and we didn't have a strict code. They basically said that students make sure that if we are simulating therapy or doing things on the floor, whatever, no cracks. So no cleavage should show or backside. It is Grad school so I wouldn't wear short cut off jean shorts or T-shirts with profanity of beer jokes on them but other than that, its common sense. About 2 weeks into my first semester I just asked my profs if I could wear long shorts and they said no problem. Btw, if you wear yoga pants I would suggest you have a shirt that covers your bottom. As one of the few males in my program, it is distracting if someone is wearing see thru legging or loose shirts and stuff is hanging out while doing a gravity eliminated ROM assessment. Perhaps some schools are more strict than others. Usually they will mention what the dress code is and if they don't, you should ask! For fieldwork, make dress nice and then based on what you see, you can dress a little more casual. Most of the time a polo or nice shirt and dress/khakis are ok.