Even if they’ve been professionally cleaned, used school swimsuits are too dirty for this marketplace. Mercari is Japan’s largest online flea market, a place where individual sellers offer an extremely wide range of new and used items. On August 3, Mercari posted a statement that it does not allow the sale of used school swimsuits, of the type worn by Japanese elementary, middle, and high school students. School swimsuits, or “school mizugi” as they’re called in Japanese, are usually nondescript black or navy-blue swimwear, shorts for boys and a one-piece bathing suit for girls, used during P.E. The sale and purchase of new, unused school swimsuits is also allowed, though these too must not have any specific school’s crest or emblem.