The purpose of this study is to consider the changes of the early twentieth century fashion in pursuit of mechanical beauty. As for the research methodology, literature survey has been undertaken. The results of this study are as following. In early twentieth century, fashion concept on the expression of mechanical beauty was considered as abstractness, atypicality, and high-tech. The abstractness of fashion was expressed by geometrical purity, box silhouette, moderate color, and cheap materials in association with mechanical reasonability and efficiency. The atypicality of fashion was connected progressive taste motivated by mechanical dynamic effect. This tendency of dress was constructed technically in response with the movement of body and totally transgressed conventional notions of clothing. The high-tech of fashion was presented by geometrical forms and metal materials in relation with the future-oriented utopia and the harmony between human and machine.