Bikini’s, which are now the most common beach and pool-wear seen in most countries around the world, were once considered an extremely provocative choice. July 5th is considered the birthday of the bikini because on this day in 1946 Louis Reard, a French clothing designer, unveiled his bikini design for the first time at a popular swimming pool in Paris. He called it the Bikini after the Bikini Atoll, which was the site of a nuclear bomb test done by the United States. Reard expected that any girl wearing his design would be a bombshell. It began to take off in Europe, where the end of World War II left people feeling liberated, right away. It wasn’t until the 60s that the US started to catch on to the fashion trend, and even then many people resisted. But bikinis caught on anyway, growing steadily in popularity ever since. Bikini Day celebrates the birthday of the world’s favorite swim suit.