May 10th, 2018. Sumo Training Hall, Asahi University, Mizuho Gifu, Japan. Two female members of the Asahi University Sumo Club untie and put back their mawashi after a training session. The mawashi is the loin-cloth belt that sumotori wear during training and competitions. It is worn on naked skin by men, and over a leotard, or t-shirts and shorts, by women.