According to the cutting diagram, the garment pieces are cut out: front piece * 1 piece; Back membrane *1; Small crotch *2 yuan. At the crotch of the front piece, the front piece is sandwiched between two crotch pieces and directly spliced with 0.5 cm seam. After the front piece is assembled, first assemble it with the small crotch and the back piece. In addition, the rear crotch can be pulled out and spliced to ensure that the spliced crotch faces outwards. After splicing the front and back, fix two layers of small crotch with 0.3 cm sewing edge.