Authors have developed a paper model CAD system by the theory of developable surfaces. By using the system, a 3-D shape after sewing can be predicted. If a space curve that means a sewn curve and a planar curve that means a piece to be sewn are given, a feasible region where the sewn surface does not intersect itself is shown. When the feasible region is very narrow, the piece is too rigid to be sewn. The information will contribute to making proper clothing. The system will be useful to design a brassiere.

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The curved shape of the combined female and male tight-fitting bodice patterns (hereinafter referred to as T-pattern, n=354) are categorized using “Concentrated Gaussian Curvature by angle (Kc=2π-θ) ”. That is, from the four main types of curved shaped T-patterns, we were able to extract differences and common features of both sexes' T-pattern shape regardless of size. Each type is as follows:
- sloping shoulder with small bust and back side darts type includes approximately half of the male T-patterns,
- standard shoulder slope with the bust and back side darts type includes 17% of both sexes' T-pattern,
- standard shoulder slope with large bust and back side darts type includes approximately 40% of the female T-patterns, and
- square shoulder with standard bust and back side darts type includes 35% of both sexes' T-patterns.
We will use these findings to establish simple, useful, and common garment pattern shape types in future.

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