The article is alms to investigate the characteristics, the originality, and the interest of fashion design of costume play, which is recently specifically popularized among young fashion mania. The influence of commercialization power of the Disneyland and the animation characters of Japanese caricatures makes the costume play to be one of the main new generation culture. Since the costume play just begins at this moment, the full understanding of the costume play is hard because of the small amount of the materials and happenings of the phenomena. However it reveals the design trends and creativity of the new generation. As the investigation of costume play fashion and the types of costume play, the following results are obtained. 1. The originality of the costume play is thought to be induced from the mask which is used against the ghost in primitive ages, the fancy parade of halloween festival, commercial advertisements of Disneyland, the Japanese caricatures, and the animation games. 2. The distinctive characteristics of Korean costume play shows the massive behaviour, which is different from the individualized costume play in Japan. This facts show the parts of the interest culture of the persons who has the equal interest. The costume play is applied as the sound showing culture, in which the young generation express and enjoy themselves by"kki" - the passion of young energy. 3. The boom of costume play introduce the increased number of costume play shop, pro model, and designer. It also introduce the interest of the new fashion design for the young generations. Thus it is expected the new fashion infra structure in near future.ar future.