What about the drawstring at the hem of the dress?

1. First, put the two belts of AB across each other, with A above B.

2. Then, circle B with A. ..

3. Then make A into an S-shape.

4. put b under a.

5. Bend Bay.

6. Put the bent part of B into the upper half of the S-shape of A. ..

7. Finally, with a little adjustment, it is finished. Look at the beautiful bow and it will come out.