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If you are seriously considering becoming a professional dancer, then one of the major problems you will face besides being able to remember all of your dance moves is finding a sotre that exclusively sells dance competition costumes. Often times, what will happen is that a professional dancer will hire a tailor to create unique costumes for them. This is great because then you can at least be guaranteed that no one will have the same outfit as you. However, hiring someone to make your costumes can also be costly depending on how complicated the outfit is as well sa the price and quantity of materials that will be needed. You could try to shop at a regular store, but that could get old really quickly because then you run the risk of having the same outfit as someone else, which would be extremely embarassing. You could also try searching for dance competition costumes on the Internet, but even then you run the risk of being overcharged and having to pay shipping and handling.