Wow, Michelle! That's really strict. I can see what you mean when you say that you're there to learn and not to impress your friends.
I would have almost no problem with that dress code. The only one I'd have is that I like to wear baggy pants/shorts most of the time.
At our school, like Morgan mentioned, it's really lax. Everyone walks around in flip-flops and spaghetti straps and halter tops and the like. I remember one day, a whole bunch of kids all wore big red t-shirts and the administration said nothing about it.
I've never had much trouble with our dress code since I'm more comfortable in a pair of jeans and a t-shirt (or hoodie, if it's cold).