I doubt there is a school that would have separate uniform requirements for different grade levels. Most schools have one supplier who provides team apparel. Swimmers are probably allowed to select both briefs and jammers. As others have noted (and as a long-time swim meet official, I have noticed) - swimmers often wear briefs in regular dual-meets, but switch to jammers for end-of-season championships. Such championships are usually 2-4 day meets, and the jammers provide much-needed support for tired upper leg muscles. A college swimmer explained that to me a few years ago.
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