This study aims to digitally reconstruct five representative traditional male costumes of Peking Opera—Mang (蟒), Pi (帔), Go (靠), Seup (褶), and Ui (衣) using 3D virtual clothing production software. Peking Opera costumes are rich in symbolic meaning, reflecting traditional Chinese aesthetics, theatrical hierarchy, and cultural heritage, but their preservation is challenging due to material fragility, deterioration over time, and limited public access. To address this issue, the study first extracted detailed structural features, patterns, colors, and embroidery motifs from historical visual references and traditional design materials. Garment patterns were then developed in a digital format, with decorative elements digitized, imported into CLO 3D, and applied to the garments with precision. Each costume was reconstructed with careful attention to accurate proportions, fabric texture, color fidelity, and traditional decorative layout based on authentic examples. The resulting digital garments effectively represent the visual, structural, and symbolic characteristics of the five selected traditional Peking Opera costumes. Our research demonstrates the potential of 3D virtual clothing technology as a valuable tool for preserving, documenting, and communicating intangible cultural heritage. By providing high-fidelity digital reconstructions, the study contributes to building accessible digital resources for virtual exhibitions, cultural education, academic research, and future applications in heritage conservation, while the findings emphasize the importance of digital tools in supporting the long-term preservation and transmission of traditional costume knowledge.