What did the American women have to wear in the 1912 Olympic swimming events?

In ancient days, swimming was usually done naked, as fabric would weigh you down. The height of swimsuit fashion was the nearly-complete coverage of the bathing suits of Victorian England, which persisted in England and the US until the 1930s. Afterward, social mores relaxed and less was covered, with the bikini becoming fashionable in the 1950s.