I let the student managers coordinate the days for what shirt. Hard to believe, but I've always had a problem with students wearing their shirts when they are not on duty. I tell them that as long as that thing is on, people are going to come up to them asking for help. Wearing it too often also means the shirt gets rather old by the end of the summer. I find, unfortunately, that there is more to wearing the uniform than putting it on.
Staff can look quite sullen or unhelpful even though they on have the right shirt.
No rolled up sleeves to show off the latest tattoo. No smoking in uniform. No Daisy Dukes. I don't know about anyone else, but I had FOUR pierced tongues last year amongst staff. Still, I think they had to work twice as hard for half the credit with camp directors sometimes.