Without real clothes, the Sumo wrestlers have more room to move about, and therefore, making it easier to tackle opponents. The thing they wear just covers them, and they are left with freedom to fight.
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they sweat a lot so if they wear shirts, the shirts will probably be soaked by the end of the match.
Boxers don't wear shirts because the shirts would get too distracting. Boxers sweat a lot and the shirts would cause irritation.