We should first understand the characteristics of body shape for how to tailor a special type of population.

First of all, the special body refers to the obese people, whose body shape is the same as that of the front and rear hips.

Because the front belly of the fat body is convex, the straight crotch is longer than the normal body of the same height, and the difference between the front and rear waves of trousers is smaller, which is 6~7 centimeters.

Moreover, if the front crotch is sewn out to the outside, therefore, if the front crotch seam can not meet the abdominal thickness of the human body, the lower crotch suture will be lifted. Therefore, the width of the front door can be increased appropriately. It can be calculated by 45% of the hip circumference, about 1/3 of the total width of the width of the hole is reduced by 0.5 centimeters, and the width of the front and back doors is 1/3:2/3.