1 First, measure your hip circumference and pants-length pajamas. These are two basic data. The hip circumference should be 20 cm, because pajamas are loose.

First, we draw a long horizontal line, which is the length of pants. Then draw a vertical line on the right hand side. The length of the vertical line is 1/4 and the hip circumference is 1 cm.

3. Then, the length of the crossbar is also 1/4, which is exactly one centimeter to form a square, above the crotch line. Extend it by five centimeters, which is the length of the crotch.

4. Divide the transverse line into three equal parts, connect the vertex of the small crotch to this point near the small crotch bay, and draw an arc. This is a small crotch bend.

5. Divide the rung line in two. Parallel to the bottom edge, this is the seam of trousers. At the lower end of the seam, the hem is divided into two parts. Two identical copies. One end is connected to the vertex of the small crotch bay, and the other end is connected to the endpoint of the transverse crotch line. So the front piece of pajamas is finished.

6. When cutting the back piece, extend the bottom edge line, waist line and crotch line on the basis of the front piece, and the middle line of the back is one centimeter to the left than the front piece. The width of the rear rail is the same as that of the front rail.

7. The length of rear gear is 15cm. At Zhiganghang 1/3, Shunhu County, Huayuan, the back end vertex. And extends more than two centimeters from the waist line.

8. Draw a vertical line from the waist line to the back crotch line. Find a line whose endpoint is parallel to the bottom edge at the center line of the trousers rail, and draw a line that is the middle seam of the trousers. The size of the foot opening is determined as the front piece, one end of the foot opening is connected with the vertex of the big crotch bend, and the other end is connected with one end of the middle crotch line. In addition, put four centimeters around the waist. This is a wound on the waist. Put the trouser leg down three centimeters, which is the welt of the trouser leg opening.