I. Introduction
Currently, in the production of garment customization, the most important thing is that how to get the garment size whose version matches the company itself through the customer's net body size and choose the most approximate version to change version accordingly. Generally, customers refer to the shape on clothes when they select them. Loose quantity is the difference between the garment size and net body size. What's more, loose quantity has an important effect on the clothing comfort, style and effect.