What Is an Obi?

The obi (帯) is the wide sash that wraps around the waist of a kimono — but calling it just a sash dramatically undersells it. An obi can cost more than the kimono itself, its tying style signals your formality level, and the way it is knotted is an art form in its own right.

Types of Obi by Formality

The Art of Tying an Obi

The obi knot is tied at the back — a position that creates a distinctive visual line from behind and signals that the wearer has dressed with the help of another person (or considerable skill). The historical reason for back-tied knots: in the Edo period, front-tied obi were associated with oiran (courtesans), who wore them in front so they could retie them easily. Respectable women wore their obi at the back, and the convention has held.

The most common knot for women is the taiko musubi (太鼓結び, “drum bow”) — a flat, squared knot that sits in the center of the back. It is the standard for most semi-formal and formal occasions: tea ceremony, coming-of-age ceremonies, theater visits, and restaurant outings. The fukuro-daiko (double-drum) is used with the most formal fukuro obi at weddings and graduation ceremonies.

For younger women and furisode (long-sleeve formal kimono), decorative knots like fukura suzume (swelling sparrow) create a sculptural effect with multiple loops above the standard taiko shape. For yukata with hanhaba obi, simpler knots — the chōchō musubi (butterfly bow) or a basic square knot — are appropriate and relatively easy to learn independently.

Men’s obi are much simpler: a narrower band tied in a simple flat knot or left with the ends tucked in, worn low on the hips rather than at the waist.

Obi Materials and Patterns

The most prestigious obi fabric is Nishijin-ori — brocade woven in Kyoto’s Nishijin district using traditional Jacquard-style looms. Nishijin obi can incorporate hundreds of colors and complex metallic patterns woven directly into the silk; a formal Nishijin fukuro obi takes days to weave and can cost ¥100,000–500,000 or more.

Hakata-ori (博多織) from Fukuoka is Nishijin’s great rival — a tightly woven striped fabric with a distinctive ribbed texture, traditionally used for men’s formal obi and increasingly for women’s casual styles. Its tight weave makes a satisfying click when tied, which is considered aesthetically pleasing.

Obi patterns are seasonal, like kimono: wisteria in late spring, pine and bamboo in winter, abstract patterns for year-round use. Matching the obi’s seasonal motifs with the kimono’s pattern requires knowledge and taste — the general rule is that the obi and kimono should not compete for attention, and at least one of them should be in a quieter pattern.

The Obi and Its Accessories

Three accessories complete the obi: the obijime (帯締め, a narrow woven cord that passes through the taiko fold and ties in front, holding the knot in place), the obidome (帯留め, a decorative clasp that slides onto the obijime as an ornament — essentially jewelry for the kimono), and the obiage (帯揚げ, a soft silk cloth tucked into the top of the obi and visible above it as a colored accent).

The obidome in particular is an opportunity for personal expression: carved coral, lacquerware, metalwork, and enamel pieces are all used, with seasonal motifs matching the overall ensemble. A skilled kimono coordinator uses these three accessories to tie together the colors of the kimono and obi into a coherent composition.