Where can I find a ballerina outfit?

My 6 year old sister is going to be in a Christmas program in her school and she needs a ballerina outfit. She needs a pink leotard, pink tights, and a pink tutu. Ballet shoes are optional. We have been looking around a bit in our area, but cannot find one. Where is the best place to order one online? Like I said, she is 6, but she is kinda big for her age.