The Chinese Button Knot is worn throughout China on underwear and night clothes.

The basic chinese button knot (ABOK #599 on one string) is usually tied with a carrick bend that attaches the two ends as a first step.

Below is the ABOK description, and several video demonstration references: [2][3][4] To tie the button: Take a piece of banding about three feet long, middle it, and lay it across the left hand as pictured.

There is however a tying method that does not require a carrick bend, rather a slip knot as a first step, and does not produce a lanyard loop that needs to be reduced when used as a button.

Which triangular hole at the S formed/back bent top center each end is tucked through in both tying methods makes a difference: