And that's why I didn't go to Mayo

That, and I heard that for cadaver labs they require khakis and a white polo (you'll have to let me know if that's true or not.) haha.
But in all seriousness, we do have our "clinic attire" days (anytime we're going to a clinical setting for a field trip, for any patient encounters, or for practical exams in classes where we're practicing treating "patients"). Those days are far and few between, maybe currently averaging one "clinic attire" day every two to three weeks.
I'm not going to lie...I really enjoy being able to wear whatever I want to class. I don't feel like dressing up nicely for lecture is necessary, or contributes to learning in any way. Yeah, you might feel more professional, but you're in a student setting. Most days I will wear nice jeans and still look somewhat nice, I'm just not doing the collared shirt and slacks thing. But somedays, it's really nice to be able to throw on sweats or yoga pants and a hoodie and go to class (especially on days when I'm not feeling well or whatever).