There were going to be a ton of ballet dancers performing at the school you went to, even those who were playing the ntucracker, and the rat king that were also in the play. You were relieved that there was no singing in the play, meaning it was just a dance related thing to do while you were in costume.
The main person you were playing was actually an individual that looks more like a ballerina, than anyone else in the play. That was, the sugarplum fairy. The thing is, she didn't actually look like a fairy, but she did wear a tu-tu in her outfit. The problem was, if people saw you wearing that, everyone was going to laugh at you. You weren't exactly sure if you would go through with this, but you also didn't want to disobey your teachers orders. You of course had no other choice.