1. First, use a ruler to measure the length of the neckline before processing, as shown in the picture below.

2. Then, use needle and thread to stitch around the loosened neckline, making sure to connect it, as shown in the picture below.

3. After connecting, leave a section of the remaining thread, pull it out with force, and tighten the originally open neckline, as shown in the picture below.

4. After tightening, take out the steam iron, but instead of ironing the neckline, place it flat about 5 cm above the neckline, and then let the iron emit steam so that the neckline can feel the steam. heat for 30 seconds, as shown in the picture below.

5. Finally, just remove the wire after cooling, as shown in the picture below.

6. This is done. Look at the effect. The neckline has changed from 16 cm to 14 cm, as shown in the picture below.