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Wiktionary
mawashi

n. (context sumo English) The belt worn by rikishi during training and in competition

Wikipedia
Mawashi

In sumo, a 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.