In the 1930s, European women wore two-piece bathing suits consisting of a halter top and shorts with some midriff visible — the navel was always hidden.
https://i.pinimg.com/originals/21/7a/bf/217abf860a86833c9a08d93aa6e25b15.jpg
On Jul 5,1946 the bikini bathing suit, created by former civil engineer Louis Reard, made its debut during a fashion show at the Molitor Pool in Paris. Model Micheline Bernardini wore the skimpy two-piece outfit, its name correlated with the July 1 American atom bomb test on Bikini Atoll.
blogspot.com
Hubba hubba!
https://slate.com/human-interest/2015/07/history-of-the-bikini-how-it-came-to-america.html