The piece of cloth on the collar of the down jacket is a spare cloth. If the down jacket is accidentally scratched or frayed, you can cut off the piece of cloth on the collar and sew it in the damaged area. Because this piece of cloth is the same color as the down jacket, after repair, it will You can't tell, it's very convenient. In addition, this piece of cloth can also be used to sew brand codes, which indicate the fabric composition, lining composition, velvet content, washing instructions, etc.