This study analyzed the fabrics of Chima, Jeogori of the 20th century. It was based on Kyungwoon Museum relics, newspaper articles and photographs. This research focused on the transition process that has been organized into three stages. The first stage is from the opening of a port to the colonial period in Korea. By this time, the casual wear Hanbok was made with the traditional cotton and woolen textiles in addition to quite a lot of upscale clothing textiles. Stage two is from 1970s to the period after the liberation and Western Costumes represent the time of when the suit was mixed. At the time of the war, due to social and economic difficulties, convenience and practicality were emphasized rather than focusing on aesthetic characteristics. Third period is from the 1980s to the 1990s when the Hanbok was no longer considered a casual wear. Instead, its high quality and elegance redefined it to be a formal wear.