Birthday Ballet Invites Saying What Should I Wear To See A Ballet?

What should I wear to see a ballet? - birthday ballet invites saying

So I was invited to go in The Nutcracker with the family of my friend for his birthday and we dress a little, what do you think should I use? It is more traditional ballet (as in not talking about New York or something) from the ballet, a performing arts center in the city. I am 15 years 5'5''with brown hair, blue eyes and green glasses.