2. First, remove the sewing thread in the middle of the trousers with a needle, and be careful not to cut the trousers.
3. Then measure the belt with a ruler, determine the center line of the belt, and mark the center line of the belt with a pen.
4. Use scissors to cut along the center line of the pants just drawn, as shown in the figure below, and pay attention to cutting accurately.
5. Measure your waistline first, determine the size of the modified pants, and then fix the center line of the cut pants with a pin according to your pants.
6. Then put the pants on the sewing machine and sew the extra pants together.
7. Then knock down the pin, put down the fixed part just now, put it together and sew it up.
8. The final effect is shown in the figure below. You can try it on and see if it suits you.