廻し
From "wikipedia":https://en.wikipedia.org/wiki/Mawashi :

[i]In sumo, a mawashi (廻し?) is the belt (loincloth) that the rikishi (or sumo wrestler) wears during training or in competition. Upper ranked professional wrestlers wear a keshō-mawashi (see below) as part of the ring entry ceremony or dohyō-iri.[/i]
mawashi