I go to a school with a dress code and it really isn't that bad. First, there is no dress code for women...they wear whatever they can get away with. For guys, wear a tie, button shirt and dockers..you're set. There are several individuals that choose to bend the rules and wear slightly non-conventional or in some cases, non-CONTEMPORARY, outfits and it's just funny. No one gets yelled at. You don't have to wear a suit. And our dress code isn't in effect 24/7. It's only required from 8-4ish M-F. And even then, the dress code Nazis are only at the door around 8am.
If you only have a few pieces of dress clothing, you need more. You may not have a formal code for class but I don't know of any school that let's you wear jeans and a T-shirt when representing the school in someone's clinical office. By rotations, you definitely need a nice dress wardrobe.
Dr_Sax