1. Turn the skirt inside out, cut a small hole with the height of elastic band on both sides of the skirt back waist with scissors, and prepare the elastic band at the same time, and measure the required length of elastic band.

2. Insert the hairpin into the elastic band, and then insert it into the small hole just cut in the skirt.

3. According to the picture below, fix one end of the elastic band on the left side of the hole with needle and thread.

4. Then, put the end of the elastic band into the cut hole, and then sew the far right side of the hole.

5. Tie a knot after sewing, and then cut the thread. The work of this hole is finished.

6. Pass the hairpin through another hole and pull it out together with the elastic band.

7. Sew the elastic band on the left in the same way as above, and sew the hole.

8. Then, turn the skirt back to the front, and the waistline of the skirt will change.