This study compares and analyzes the virtual fitting results of tailored jacket according to differences in digital production workflows using the CLO 3D virtual fitting program. The workflows presented in educational materials were examined based on the preparing, modeling, and finishing stages. This approach enabled identifying essential workflows and performing virtual fitting simulations using the same tailored jacket design to compare differences in results. The findings indicate that the pattern composition method directly influenced 3D appearance and structural stability of the garments. When more complex internal structures were incorporated, the silhouette appeared more realistic, although the increased number of contact points reduced simulation stability. Moreover, details such as armholes, sleeve slits, and welt pockets were most effectively represented in workflows that closely reflected actual sewing processes, thereby enhancing the overall completeness of the virtual garments. These results highlight the importance of choosing an appropriate workflow when considering the design objectives in digital garment production. In particular, adopting workflows based on real sewing structures is essential when the goal is to improve detail representation and overall garment completeness. This study emphasizes the academic significance of systematically examining workflow differences in CLO 3D, providing new insights into how digital garment production workflows influence simulation accuracy and quality.