Always wear to the second audition (and any subsequent auditions, no matter how many) the same thing you wore to the first audition. The reason? Because auditors frequently make mental (or written) notes of what you are wearing to help them identify you. If you change costumes, they frequently get confused. Jerry Robbins asked me at the end of a day of auditions why I hadn't brought back the girl in the orange sweater. I had, but she was wearing a purple dress. I'm not sure we ever did get that straightened out. You can help the auditors by wearing the same thing every time you audition