This study establishes an online customization platform for New-hanbok based on analyzing the hanbok brands and the preference for new-hanbok skirts. This study aims to develop a design that can recommend a modern hanbok skirt so that customers can purchase it online. Design elements according to body parts of each age group were extracted in two-dimensional and three-dimensional techniques, and short, medium, and long skirt designs were selected. The pattern for the selected design was made through YUKA Apparel CAD, and the design was confirmed by simulating by using a CLO 3D program. Pattern production dimensions were produced by substituting the dimensions of women in their early 20s from the 7th body dimension survey report of Size Korea. The applied dimensions are 161.0 cm in height, 71.0 cm in waist circumference, and 93.0 cm in hip circumference. The exact dimension was applied to the virtual model for 3D simulation. As a result of examining design elements for 3-Dimension, young people in their 20s and 30s preferred long skirts of around 80cm, and older people preferred medium-length (60cm). Except for those in their 20s, short length (45cm) was the least preferred, so skirt length was found to be related to age. Regardless of age group, the waist width was about 5cm, which was the most preferred. Next, it seems that the simple shape of the skirt was designed with a change in the waist of the skirt, preferring a wide width. The most preferred length was an average length of about 60cm, followed by about 100 cm. Young people preferred monochromatic colors for skirts, and older people preferred chromatic colors such as red and blue. Patterns were preferred more in the older age group than in the younger age group, and flower patterns were preferred the most. Among the developed skirt designs, the top three types with high preference seem to be related to individual tastes and age. Customers can purchase a recommended skirt simultaneously or re-recommendation for a new skirt by revising design components.