Hello Amy! It might be a good idea for you to call the school and simply ask them what is proper. You might not even have to give your name, if you don't want to. Otherwise, at least for the first few lessons, I would go with a black leotard, your choice of style and pink tights with pink shoes.
Again, it might be better for you to check by calling. You certainly don't want to start off on the wrong foot (no pun intended). [/i]