1, turn the skirt in, and then cut a small hole on both sides of the back waist. The height of the hole is just the same as that of the elastic band. Prepare an elastic band and measure the length of the elastic band.

2. Thread the hairpin into the elastic band and then into the small hole in the skirt.

3. As shown in the figure, fix the elastic band on the right side of the skirt waist with needle and thread, and sew it in the middle of the right side first.

4. Then, put the elastic band into the hole and sew it on the far right. Pay attention to sew the ends of the rightmost elastic band together.

5, sewing knots, thread cutting.

6. Pass the hairpin through the hole on the left and connect it with elastic band.

7. Sew the elastic band on the left side of the waist in the same way and sew the hole.

8. Finally, turn the skirt back to the front, so that the waistline of the skirt changes.