3 shaku (approx. 90.9 cm); waistband; belt; cloth girdle
Primarily a traditional measurement of length (3 shaku ≈ 90.9 cm). Also used metonymically for a waistband or cloth belt, especially in contexts like sumo or traditional clothing, where a 3-shaku cloth is wrapped around the waist.
Wrap a 3-shaku cloth as a makeshift belt.
The sumo wrestler ties his waistband and enters the ring.
帯 is the general word for a sash or belt, while 三尺 specifically refers to a 3-shaku length cloth used as a waistband, often in traditional or sumo contexts.
From 三 (three) + 尺 (shaku, a traditional Japanese unit of length). The waistband sense comes from the typical length of cloth used.