Since Homeros in Greece, Mimesis was thought to be an art to imitate the nature, and it means an imitation of the nature classically. Mimetic theories were set to be a kind of art work in the era of Renaissance, and the terminology of mimesis was widely used to replace it with an originality in the 15th century. The purpose of this study is to understand the aesthetics of mimesis expressed in 2000s fashion. For this purpose, I investigated the theories of the mimesis, categorized the definition, then applied those categories for 2000s fashion. Documentary studies were conducted through aesthetics, fashion books and demonstrative studies were processed by analyzing photos from collection fashion magazines and fashion site of internet. In the history of aesthetics, the mimesis could be defined into three categories; the similarity and the representation mimesis, the symbol mimesis and the abstraction mimesis. In fashion, the representation mimesis included a natural and a folk, a period that of 1900s and ancient representation mimesis. The symbol mimesis included psychology and fear symbol mimesis. The abstraction mimesis included hard color, a geometric simplification and distortion mimesis. Analysis on the mimesis expressed in 2000s modern fashion may provide an excellent method for understanding human aesthetic in costume.