We present a 3D garment design method for scanned human bodies. First, a slicing method is proposed to reconstruct a symmetricbody from a scanned human body to make it suitable for garment design. Second, a sketch modeling method is used to interactively createa garment surface based on the symmetric body. Third, seam lines are drawn on the garment surface, and then a flattening algorithmis employed to design 2D patterns. Finally, a seam line template is used to design the same style of garments for different bodies. Experimentsshow that the resulting garment fits the scanned body well. Our method provides an efficient design tool for customizing garmentsin the fashion industry.