In sumo, a mawashi (廻し) is the loincloth that rikishi (sumo wrestlers) wear during training or in competition.
If a wrestler's mawashi comes off during a tournament bout, he is automatically disqualified. This is extremely rare, but did occur in May 2000, when sandanme wrestler Asanokiri's mawashi came off during a match with Chiyohakuhō. However, for most of sumo's history, whether or not a wrestler's mawashi came off during a bout was considered irrelevant, and the policy of disqualification only came into place when Japan began adopting European attitudes towards nudity.
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