red and white sash
General term for a sash or obi that is red and white, often used in ceremonial or festive contexts.
They wore a red and white sash at the celebration.
red and white belt
Specifically in martial arts, a belt awarded to high-ranking practitioners, often indicating a master level.
He earned a red and white belt in judo.
Compound of 紅白 (red and white) and 帯 (sash/belt). The martial arts sense derives from the use of a red-and-white belt as a symbol of high rank.