Digital technology is applied to the design of traditional cultural costumes to realize the three-dimensional construction and reproduction of traditional costumes. Through the techniques of image enhancement and smoothing, image measurement and edge detection, the color value of the Song Dynasty costume image, the pattern data of the crown costume and the outline of the pattern are obtained. Through the CLO3D system, the digital design and three-dimensional display of traditional cultural costumes are realized, and finally, the design effect is evaluated and studied. In this paper, the research mainly obtained the 12 color RGB and CMYK values of the Song Dynasty crown dress, the length of the longitudinal size of each pattern, the ratio between each part of the crown dress and the height of the corresponding figure (not more than 80%). And it was applied to digital construction. In the evaluation of traditional cultural dress design, the degree of traditional cultural wind is in the range of 3-4, and the evaluation of the design effect mainly focuses on the range of 2-3.