one-piece sash; maru obi
A traditional Japanese sash (obi) made from a single piece of fabric folded in half lengthwise, often used with formal kimono.
A luxurious maru obi is often used for bridal attire.
Compound of 丸 (まる, 'round' or 'whole') and 帯 (おび, 'sash'), referring to the sash being made from one whole piece of fabric.