Personalized customization is a new manufacturing trend in high-end products (e.g. senior custom clothing).Traditional apparel customization (made-to-measure & bespoken) highly depends on experienced tailors. A personalized mannequin is essential for apparel customization using CAD technologies. Currently, a common method of reconstructing mannequin is based on body measurements or body features. It only preserves the body size instead of preserving the accurate user's stature. However, the same human body measurement does not equal to the same body shape. This may result in an unfit garment for the user. This paper proposes a novel scanning-based pipeline to reconstruct a personalized mannequin, which preserves both body size and body stature information. We first capture the body of a user via 3D scanning, and a statistical body model is fit to the scanned data. This results in a skinned articulated model of the user. The scanned body is then adjusted to be pose-symmetric via linear blending skinning. The updated pose-symmetric body is then segmented to initialize the stature symmetry processing. Finally, a slice-based method is proposed to generate a symmetric 3D mannequin. The process of apparel customization can be easily digitalized with the help of the proposed mannequin reconstruction system and the corresponding existing clothing CAD software.