You could wear a long sleeved buttoned up shirt with some black jeans and leather shoes or just any shoes in general, they will hire no matter what unless the team is full.
A nice pair of black pants, leather black shoes and a nice long sleeved shirt.
School uniform is accepted but semi-formal attire would be more appropriate.
Anything, they will hire you no matter what.
professional shoes, black leather non stick, to prove you own some.