1. Preparation materials: a piece of cloth with appropriate size, scissors, sewing machine, needle and thread, rope, etc.
2. According to your figure and preferences, design and cut out fabrics with appropriate sizes.
3. Sew two pieces of cloth opposite each other, leaving two shoulder straps, and the hem is not sewn.
4. Turn the shoulder strap to the front and fix it with needle and thread.
5. Leave a small hole in the hem, pass the rope through and fix it with needle and thread.
6. Check whether there is any untreated place last time, and make necessary arrangement.
Precautions:
1. Choose fabrics with good air permeability and high comfort to make small vests.
2. Leave some margin when cutting for later pruning.
3. Pay attention to whether the thread is firm when sewing, so as to avoid dropping or cracking when wearing.
Here's how to make a video: network link.