This is by far the largest costume shop in Austin, and it's the greatest fun to visit or shop. It gets very, very crowded near Halloween, so if you need a costume for a party go early or be prepared to put up with the crowds. As far as the costumes, you can rent of buy, and the prices are very reasonable. The variety in costumes and sizes available is huge - you will find what you're looking for or perhaps something better. They also have a section dedicated to accessories like wigs, makeup and other things you might need to make your costume a smashing success.