帯Obi (sash)

An obi (帯) is a sash of varying size and shape worn with both traditional Japanese clothing and uniforms for Japanese martial arts styles. Originating as a simple thin sash in Heian period Japan, the obi developed over time into a sash with a number of different varieties, with a number of different sizes and proportions, lengths, and methods of tying. The obi, which once did not differ significantly in appearance between men and women, also developed into a greater variety of styles for women than for men.

Despite the kimono having been at one point and continuing to appear to be held shut by the obi, many modern obi are too wide and stiff to function in this way, with a series of ties known as koshihimo, worn underneath the obi, used to keep the kimono closed instead.

Obi are categorised by their design, formality, material, and use, and can be made of a number of types of fabric, with heavy brocade weaves worn for formal occasions, and some lightweight silk obi worn for informal occasions. Obi are also made from materials other than silk, such as cotton, hemp and polyester, though silk obi are considered a necessity for formal occasions.

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