The following are the specific steps to solve the problem of cashmere trousers falling:

Tools required: wide elastic band, needle and thread.

1. First, sew both ends of the wide elastic band with needle and thread to get an elastic band.

2. Then sew it up, and there is an elastic band.

3. Align the edge of the elastic band ring with the edge of the waistband of cotton trousers.

4. Sew the aligned end once.

5. After sewing, the elastic band is fixed on the belt to prevent the cotton trousers from falling off.

Note: you can buy velvet cotton trousers with rope buckles, just tie them tightly.