Traditional ethnic minority costumes feature diverse decorative techniques and rich decorative materials, which often result in complex degradation phenomena and multifactorial deterioration. During the intervening conservation and restoration of a Qing Dynasty Gengma Dai women’s blouse (Museum Dai clothes collection No.166) in Yunnan Provincial Museum, it was found that the blouse’s edge was decorated with straight yarn colored ribbon, obliquely woven silver ribbons, and black satin. These components, composed of both organic and inorganic materials, were assembled through multi-layered inlaying and laminating processes, creating a highly complex decorative structure. Under multiple factors, the various decorative materials exhibited differing degrees and types of damage, with losses in some areas. As a result, it is necessary to use specialized supplementary methods, including targeted embroidery and stitching treatment, in different areas. Using two representative edge decorations from the garment as case studies, this paper discusses restoration strategies for composite-material structures. It integrates advanced scientific techniques with traditional conservation methods, and includes real object study, ethnological field investigation, and literature review to ensure that the restoration decisions are informed by scientific evidence, and ethnic information was maintained to the greatest extent.