Not all costumes are serious. The Rebel Cheerleader is a pure fun costume, and all parts are bought, I didn't make anything myself. It's simply a costume to run around in during cons, when you want to be in something really comfortable, but still show that you are a costumer. It's expensive, but the price is due to the quality of the fabrics and the construction.
One thing is certain. When I started costuming I sure didn't know that one day I would have to learn how to "fluff" a pair of cheerleader pom poms.