1. Remove the sewing thread of the sleeve first, and then remove the sleeve.

2. Then roll in the extra small half sleeve, align it, fold it, and get ready to lock the edge to avoid dropping the thread.

3. After threading the needle, for the sake of beauty, don't expose the thread. When lifting the needle, wear it from the inside out and let the thread hide inside.

4. Starting from the vicinity of the shoulder, aim at the shoulder first, and aim at the underarm part during threading.

5. At the end of sewing, the thread ends are treated as above, and sewn between two layers of fabric.

6, so the coat is changed into a vest.