Materials required: needle, thread.

1. First, insert the needle from the inside of the down jacket and pull it out from the outside, as shown in the picture below.

2. Then, after passing it through from the other side, pass it out one millimeter directly from the top, and then pass it through to the other side, as shown in the picture below.

3. Repeat this action until the entire opening is covered, as shown in the picture below.

4. Use the method of pressing a thread and threading it from top to bottom. Repeat this action until the entire hole is darned, as shown in the picture below.

5. This is done. Take a look at the effect, as shown in the picture below.