What to wear for musical tryouts?

I am trying out for high school musical 2 at my local theater and they said that we would have a cold reading, vocal tryouts,and a short hip- hop style dance. I am unsure of what I should wear. I am not by any means a dancer, but I can dance if if comes down to it. I was thinking of wearing some light sweat pants, tennis shoes, a pink tank top and a black cardigan- style jacket that is very light. Would this be too unprofessional and casual looking, and if so what do you suggest I wear? P.S. I think I'm going for the part of Kelsey, the girl who writes the songs.