Young Blonde Girl Outside Wearing Pink Swimsuit

In the 19th century, the woman's two piece suit became common—the two pieces being a gown from shoulder to knees plus a set of trousers with leggings going down to the ankles.
In the Victorian era, popular beach resorts were commonly equipped with bathing machines designed to avoid the exposure of people in swimsuits, especially to people of the opposite sex.
In the United States, beauty contests of women in bathing costumes became popular from the 1880s. However, such contests were not regarded as respectable. Beauty contests became more respectable with the first modern "Miss America" contest held in 1921, though less respectable beauty contests continued to be held. Norman Rockwell judged the Miss America 1922 bathing beauty contest along with Howard Chandler Christy and James Montgomery Flagg. They were all unclear as to how to judge the contest. One judge suggested that they judge each part or feature of the body out of ten, then the woman with the total highest score would win. After they had tried the system, they discovered that although one woman might have beautiful individual parts fr features, she might not be beautiful over all. So they "...gave up trying to figure out a system and resolved to trust our eyes. It led to squabbles, because all of us didn't look at things in the same way, but it was the best we could do."
In 1907 the swimmer Annette Kellerman from Australia visited the United States as an "underwater ballerina", a version of synchronized swimming involving diving into glass tanks. She was arrested for indecent exposure because her swimsuit showed arms, legs and the neck. Kellerman changed the suit to have long arms and legs and a collar, still keeping the close fit that revealed the shapes underneath. She later starred in several movies, including one about her life. She marketed a line of bathing suits and her style of one-piece suits came to be known as "the Annette Kellerman." The Annette Kellerman was considered the most offensive style of swimsuit in the 1920s and became the focus of censorship efforts.