This study explores women's Wonsam in the 18th century. Wonsam was women's wedding dress, one of the representative ceremonial garments of Korea. Wonsam began to appear in the excavated clothes around the 18th century, and we can find drawings and records of the period in Yongjae Collections by Kim-kunhaeng. The form of Wonsam after the 17th and 18th centuries showed the changes in which Seop and Mu disappeared in Baeja form of Danryoung(團領) and the right and left symmetry and side slits were highlighted. The change also included wide and long sleeves and Sakdong(색동) colorful strips on the sleeves), Hansam ornaments, and the use of the belt, which means the change of Baeja composition into our traditional costume of the age. Through the Colletions, we notice that women wore Wonsam in different colors and with varying hair accessories according to the nature of ceremony, the social status, and marital status. Concerning Wonsam, the color of clothing for the dead woman was green(喪禮), while that for marriage ceremony was red(婚禮). Wonsam with the light color was for ceremonial clothing(祭禮). The women who served in the palace wore green Wonsam and Geodumi, while a bride at the marriage ceremony wore red Wonsam or a red long-sleeved robe with Jokduri. At the ceremony of Hyeongunorye, women wore Wonsam with a wig. the dead woman wore Yemou.