The classification of trousers is divided into six categories according to the length of trousers.

1. hot pants, according to the number of 0.3 minus 6~8 cm; shorts, according to the number 0.3 plus 4~6 centimeters;

2. knee pants (six pants), according to the 0.3 minus 6~8 centimeters.

3. medium pants (seven pants, three bone trousers), 0.4 cm plus 6~8 cm;

4. slacks (eight pants, leg pants), according to the number 0.5.

5. slacks (nine pants), according to 0.6 minus 6~8 cm;

6. western trousers, plus 0.6 centimeters plus 4~6 centimeters.

The "number" here refers to the standard clothing size of a height of 160 centimeters.

Source: world clothing shoes and hats net