Japanese vintage obi in blue and gold with embroidery. The size is 140 in long x 6 in.An obi is a belt worn with both traditional Japanese clothing and uniforms for Japanese martial arts styles. Originating as a simple thin belt in Heian period Japan, the obi developed over time into a belt with a variety of different sizes, lengths and methods of tying, with a greater variety of women's types of obi than men's.