re: Juilliard Outfit
I did not go to Juilliard, but I would wear some nice linen slacks, which usually have drawstring closures and a fine gauge wool v-neck sweater. That's comparable to khakis and a button down in formality and definitely less constrictive than jeans. Just a suggestion. You could also bring along some more movement-friendly options. That way you could lessen any potential worries.