To provide trousers high in production freedom, capable of corresponding to cloth of all sizes, and capable of appropriately corresponding to a figure of a wearer.

A pair of trousers 10 is produced by preparing a quadrilateral body cloth 21 with diagonals crossing at right angles, and two side cloths 22, and sewing the two side cloths on both sides of the body cloth folded by one diagonal. The body cloth is such that with respect to a front side part 21A with two equilateral sides and a back side part 21B, each of the two equilateral sides forming the vertical angle part of the back side part is cut off so as to make the vertical angle larger than the original vertical angle, and the vertical angle part of the front side part and the vertical angle part of the back side part are formed in a form of being cut off in a curved line along the waist of a wearer. A side part is formed by sewing each of the two sheets of side cloth onto between two sides adjacent to each other and forming the quadrilateral form of the body cloth.