According to the knowledge of plane geometry and solid geometry, the theoretical formula of the bra cup dart\'s dimension and angle was deduced based upon bra cup model.

By the experiments of drawing up to match the breast model,which were carried out taking the height of under-cup or the length of under-edge as the quantitative and observed from front to side,the study showed that a non-linear quantitative relationship exists in the height of under-cup,the length of under-edge and the size of bra-dart during a bra\'s paper design.

Study of molding properties for bra-cup of warp-knitted spacer fabrics