The Japanese waistband is known as an OBI, which is a three-letter word. An OBI is a sash-like belt that is typically worn with traditional Japanese clothing such as kimonos. It is usually made of silk or other fine fabrics and is tied in the back in a large bow. The OBI can be decorated with embroidery, beads, or other embellishments. It is an important part of traditional Japanese dress and is often used to indicate the wearer's social status.