Bikinis or two-pieces are a type of women's swimsuit that has two separate parts. One part covers the breasts while the other part covers the groin. There is an uncovered area of skin between the two parts. The shapes of the two parts usually look women's underwear. The lower parts of bikinis can range from thongs or g-strings to the more modest modest square-cut shorts.
Bikinis have been worn by women for sports as seen on Greek urns and paintings, dated as early as 1400 BC.
Modern bikinis were invented by a French engineer named Louis Reared and a fashion designer named Jacque Heim in Paris in 1946. They presented their new invention at a fashion show on July 5 1946 at the Piscine Molitor in Paris. They were bikinis with g-string backs. They were named after the Bikini Atoll. The Bikini Atoll is in the Pacific and is one of the islands that make up the Marshall Islands. A few days before the fashion, they were site of a nuclear weapon tests. The reaction to these bikinis was as strong as a nuclear bomb.
It should be noted that women in Paris were wearing something like bikinis before the French engineer and French fashion designer invented them. You could see pictures of women wearing bikinis in the July 16, 1945 issue of Life. The article accompanying the photos called them French bathing suits. They couldn't be called bikinis yet because the Bikini Atoll nuclear tests had not happened yet. Despite not having the name yet, the Parisian women in the photos clearly wearing bikinis in the same style and coverage that bikinis usually have.