This research analyzes the late Joseon`s variously developed characteristics of women`s underwear and its formative elements, and ultimately aims to apply such characteristics to designing modern outfits. The main purpose of the presented work is to give guidelines on utilizing the fashion legacy in a various way, and inheriting the traditional concept of beauty by developing it into modern fashion designs. The designing and producing of the work is based on the analysis of previous researches, genre paintings, and traditional costumes in museums. Based on this research, the application of traditional underwear design to today`s outfits involves the following points. First, the presented work features the formative outlines of traditional underwear as an inspiration for outer garments. Secondly, various traditional textiles are used such as ramie fabrics, damask silk, silk fabrics, fur, etc. for four seasons and they are turned to practical use for modern outfits. Third, colors of choice are white and low saturation colors to create an elegant and serene atmosphere. Finally, traditional sewing techniques are specifically applied to modern fashion designs. Included are: Nubim technique , Gob-sol technique, and the patching method. This work pursues the design of practical use by tying up clothes with straps and knots to prevent them from falling off.