Legal analysis: swimsuit: women's swimsuit. Generally made of cotton or chemical fiber fabric, the surface is smooth, monochromatic or patterned. According to the rules of swimming competition, the swimsuit for competition must be a dark (or dark pattern) upper and lower body one-piece swimsuit, while the swimsuit for entertainment or fitness is not subject to this restriction. Swimming trunks: men's swimming suits, mostly made of cotton, wool or chemical fiber fabrics. Suitable for briefs, monochrome or with various patterns. The rules of swimming trunks for competitions stipulate that they must be dark, and the crotch length on both sides should not be less than 10 cm.

Legal basis: Article 31 of the Sports Law of the People's Republic of China. The state implements hierarchical and classified management of sports competitions. The national comprehensive sports meeting shall be managed by the sports administrative department of the State Council, or by the sports administrative department of the State Council jointly with relevant organizations. The national individual sports competitions are managed by the National Individual Sports Association. Measures for the administration of local comprehensive sports games and local individual sports competitions shall be formulated by local people's governments.