Excuse me, how did the trouser legs of school uniforms come from?

The method of rolling the trouser legs of school uniforms is as follows:

1. Straighten the distance between the calf and the foot surface of the school uniform pants, and be careful not to wrinkle.

2. Fold the excess parts on the inside and back of the trouser leg forward slightly.

3. Hold the position just folded with one hand and roll the trouser leg with the other hand.

4. Repeat the second and third steps, and then roll up your pants.

5. After the second lap, roll up the corners of the school uniform pants.