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1 of 23A woman wearing a fashionable bathing costume, circa 1870.Hulton Archive—Getty Images -
2 of 23Holidaymakers posing in bathing suits in the ocean surf at Santa Monica, Calif., circa 1890.American Stock Archive—Getty Images -
3 of 23Woman in one-piece bathing suit and cap reclining on a beach in France, circa 1900.Universal History Archive—UIG via Getty Images -
4 of 23A Girl in A Bathing Costume, circa 1909.Past Pix/SSPL—Getty Images -
5 of 23Annette Kellermann, circa 1910.ullstein bild—Getty Images -
6 of 23Four young women in matching beach wear run out of the surf, Los Angeles, circa 1910.Underwood Archives—Getty Images -
7 of 23Actress Elsie Marson in a red silk swimsuit with white embroidered spots, circa 1918.d' Ora/ullstein bild—Getty Images -
8 of 23A woman in a bathing suit poses in front of a studio ocean scene, Paris, France, circa 1920.Underwood Archives—Getty Images -
9 of 23Woman having her swimsuit measured for length violations on a Washington DC beach, circa 1922.GraphicaArtis—Getty Images -
10 of 23Five women walking arm-in-arm on the beach wearing wool bathing suits, circa 1925.GraphicaArtis—Getty Images -
11 of 23A bathing dress, circa 1926.Alexander Binder—Getty Images -
12 of 23Dancer Alice Nikitina wearing a striking bathing suit at the beach in Alassio, Italy, circa 1929.Underwood Archives—Getty Images -
13 of 23Belted one-piece jersey bathing suits with stripes on the bottom; designed by Lucien Lelong, circa 1929.George Hoyningen-Huene—Condé Nast via Getty Images -
14 of 23Swimsuit fashion in Paris, France, circa 1930.Keystone-France/Keystone-France—Getty Images -
15 of 23Woman wearing cut-out swimming suit at the Aquatic gala at Molitor swimming pool, on June 23, 1931 in Paris.Keystone-France—Gamma-Keystone via Getty Images -
16 of 23Verna Lee Fisher sporting her newly created crossword swimsuit with matching bathing hat, at Palm Beach, Fla., circa 1933.General Photographic Agency—Getty Images -
17 of 23The Latest In swimwear on a beach In California, circa 1934.Keystone-France—Gamma-Keystone via Getty Images -
18 of 23Actresses Ida Lupino and Kathleen Burke model the latest swimwear circa 1935Keystone—Getty Images -
19 of 23Actress Alexis Smith in a swimming costume running along the beach in southern California, circa 1940.FPG—Getty Images -
20 of 23Bathing suit clad female members of the British Imperial Censorship Staff, who call themseleves the censorettes, standing poolside at the Princess Hotel, which also serves as their offices on the island. Circa 1941.George Strock—The LIFE Picture Collection/Getty Images -
21 of 23Model posing in bathing suit in Florida, circa 1945.Nina Leen—The LIFE Picture Collection/Getty Images -
22 of 23Two models wearing bathing suits and bathing caps, circa 1946.Gjon Mili—The LIFE Picture Collection/Getty Images -
23 of 23The new 'Bikini' swimming costume caused a sensation at a beauty contest at the Molitor swimming pool in Paris. Designer Louis Reard was unable to find a 'respectable' model for his costume and the job of displaying it went to 19-year-old Micheline Bernardini, a nude dancer from the Casino de Paris. She is holding a small box into which the entire costume can be packed. Celebrated as the first bikini, Luard's design came a few months after a similar two-piece design was produced by French designer Jacques Heim.Keystone—Getty Images
Think it’s hot at the beach these days? Imagine wearing wool, which is what the first garments we’d recognize as swimsuits were made of.
But maybe wool had its charms.
“Our forebears knew that wool offers protection against chills,” LIFE noted in a July 1, 1940, spread on the latest trends in swimsuits: that season’s brave yet “vain” women “gladly shivered for fashion’s sake” in cotton and rayon.
That’s just one of the surprising tidbits gleaned from wading through the above photos, which trace the evolution of swimsuits from Victorian-era bathing costumes to the bikini. Advances in mass transit and the spread of the idea of leisure time made the beach more accessible to more people starting in the mid-19th century, so it makes sense that that would be when bathing suits designed for leisurely swims became available. In the 1870s, swimsuits in North America involved corsets, bathing shoes and hose, according to World Clothing and Fashion: An Encyclopedia of History, Culture, and Social Influence.
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The sleeveless one-piece became especially popular in 1907 after police arrested Australian professional swimmer Annette Kellermann for indecency when she wore one at Revere Beach north of Boston. “By promoting swimming as exercise for women and for Olympic competition and vaudeville, Kellerman continued to influence skirtless, sleeveless beach and performance wear,” World Clothing and Fashion notes.
More form-fitting styles came out in around the 1930s with the development of new and stretchier synthetic fabrics.
Two-piece swimsuits did exist by then, but they mostly covered up the belly button until July 5, 1946, when 19-year-old French model and dancer Micheline Bernardini debuted the four fabric triangles known as a “bikini” at the popular swimming pool Piscine Molitor.
Created by Louis Reard, it made a bigger splash than a similar suit, the Atome, that had been released earlier that year by Jacques Heim. The simple reason: it used even less fabric. Both names spoke to a particular moment in history: their names referenced the development of atomic weapons. (Bikini Atoll was famously the site of atomic-weapons testing.) People at the time lived with the fearsome knowledge that nuclear war was now possible, but also with the hope that the science behind the bomb might lead to great advances. As TIME explained the significance of the timing of Reard’s invention when the bathing suit celebrated its 50th anniversary:
Two years earlier, the French had enjoyed the euphoria of liberation from the Nazi Occupation. The tiny suit was named the bikini, in honor of the tiny Pacific atoll where the U.S. was testing atom bombs….Designer Louis Reard, a onetime engineer with Renault, the car company, had been turning out modest knit bathing suits since 1925, but in 1946 he realized that with the return of peace, people would want to start enjoying themselves again.
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