reversible obi; two-sided obi
A traditional obi with a different color or pattern on each side, allowing it to be worn two ways. Related to 昼夜帯.
See also: 昼夜帯
From my grandmother's chest of drawers, a reversible obi with different colors on each side appeared.
A reversible obi is a convenient sash that can be used differently depending on your mood or kimono.
The origin of the name 鯨帯 (whale obi) is uncertain; it may refer to the baleen (whalebone) once used in obi construction, or to the idea of a whale having a dark back and light belly, resembling the two-sided color scheme.