Olympic Games have been the most important international swimming competition. While men's events were an integral part of all Olympics, women's races were introduced only in 1912, and until 1924 were limited to a couple of freestyle events.

Public nudity was a major concern in designing early swimwear. It was a major factor behind the non-participation of American women in the 1912 Olympics.^[3] At those Games British women wore full-body silk suits of such a volume that they could be passed through a wedding ring. The suits were complemented by bras and bikini-style briefs as they became transparent when wet. Women's coaches were rare at early Olympics, and to further reduce the chances of harassment women were accompanied by chaperones.^[4] Even men wore one-piece swimsuits covering the body from hips to shoulders up to the 1940s.^[5] In 1928, Speedo introduced their racerback silk suit that was optimized to fit the body shape.^[6][7] It uncovered the shoulder blades, which almost resulted in disqualification of Clare Dennis at the 1932 Olympics,^[8] but became a norm by 1936.^[9] Meanwhile, men were allowed to swim in bare-chest suits in 1936, and in briefs only at the 1948 Olympics.^[6][10] In 1956, Speedo became the first company to introduce nylon^[11] and in the 1970s elastane to their swimsuits that improved their elasticity, durability and water drag – 21 out of 22 records at the 1972 Olympics were broken using nylon/elastane suits.^[6]

At the same Olympics, East German swimmers adopted suits that were tightly following the body shape, the so-called "skinsuits". They were initially made of cotton and became virtually transparent when wet. The revealing shape and transparency caused outrage among US swimmers; meanwhile, at the 1973 World Aquatics Championships, East German women won 10 of 14 events and set seven world records. Those championships became the turning point for the world to adopt the skinsuit, modified with novel synthetic materials, as a standard competitive swimwear.^[12]

In 2000, Speedo launched the Fastskin suit series that mimicked shark skin. Their surface contained bumps and ridges that channeled the water over the swimmer's body approximately 3% more efficiently than traditional materials.^[13][14] Those suits covered most of the body, from neck to ankles and wrists, and their shape was optimized for specific swimming strokes, compressing some body parts while allowing more freedom to the others.^[15][16] Those suits were approved for the 2000 Olympics, where they helped win 83% of the medals.^[14] By the next Olympics, similar suits had been developed by Tyr Sport, Inc., but they were not approved by the FINA.^[17]

In February 2008, Speedo launched the LZR Racer swimsuit based on woven elastane-nylon and polyurethane (50%). The suit was developed by Italian company Mectex, in association with the Australian Institute of Sport and NASA, which provided wind tunnel testing facilities.^[18][19] The suits were manufactured at Petratex, a textile factory in Paços de Ferreira, Portugal, where the technology is patented.^[18] Like other suits used for high competition racing, LZR Racer allows for better oxygen flow to the muscles, and holds the body in a more hydrodynamic position, while repelling water and increasing flexibility.^[20] The seams of the suit are ultrasonically welded to further reduce drag.^[16][18][21] The suit is 100% chlorine resistant and quick in drying.

Endorsed for competitive use by FINA prior to the Beijing Olympics,^[21] the suit reportedly can lower racing times by 2–4%,^[16][22] This was corroborated at the Beijing Olympics, where swimmers wearing the suit set 23 out of 25 world records and won 94% of the races and 89% of the medals.^[23]

Following the LZR Racer example, alternative non-textile suits have been introduced by other companies in 2008. Some of them like the Arena X-Glide, Jaked01 and Adidas Hydrofoil were entirely made of polyurethane.^[24] By 24 August 2009, more than 130 world records had been broken by swimmers wearing non-textile suits, and more than 90 of them were set with the LZR Racer.^[19][24][25]

FINA rule changes edit

In an abrupt reversal of opinion, the FINA Congress voted almost unanimously to revert its previous policy and ban all body-length swimsuits. The decision was taken in Rome on 24 July 2009, during the 2009 World Aquatics Championships. The new policy states that men's swimsuits may maximally cover the area from the waist to the knee, and women's counterparts from the shoulder to the knee. FINA also ruled that the fabric used must be a textile or a woven material and that a suit may not have any fastening devices such as a zipper (drawstrings on male jammers are allowed). Textile was defined as any open-mesh material like cotton, Nylon, Lycra, etc. The new regulations took effect on 1 January 2010,^[26] and the previous records set in non-textile suits remain valid.^[24][25]

The first competitive swimmer to use goggles was Thomas William Burgess, during his crossing of the English Channel in 1911. His motorcycle goggles leaked water, yet they protected his eyes from water splashes during his breaststroke-only swim. In 1926, Gertrude Ederle also used motorcycle goggles when crossing the Channel. She swam crawl and therefore sealed her goggles with paraffin to render them water tight. Meanwhile, the vast majority of pool swimmers had no eye protection until the late 1960s, which limited their training time due to the eye irritation with disinfectants added to the pool water. When the first commercial goggles were introduced to competitive swimmers in 1968 they were met with limited success because of their fixed and rigid shape. Most swimmers could not fit them to their face and complained about leaks, especially after starts and turns. Only two years later David Wilkie became the first swimmer to use goggles in international pool competitions, at the 1970 Commonwealth Games.^[27] Goggles were first allowed at the Olympics in 1976, and many athletes used them in preparation at the 1972 Games.^[28]

Swimming caps were used since the early 1900s, when they were made of cotton, silk, or rubberized fabrics and often featured an "aviator-style" chin strap to hold the cap in place.^[29] Stretchable and water-tight latex caps became widely available in the 1920s^[1] and more durable and smooth silicone caps in the 1970s. Further efforts to improve silicone caps went into eliminating wrinkles, which resulted in the seamless caps and then in more rigid "racing dome" caps of globular shape.^[30]

• Competitive swimwear
• High-technology swimwear fabric
• History of bikini
• History of swimwear
• Swimming at the Summer Olympics

• Daily News (8 June 2012) London Olympics 2012: The evolution of Olympic swimsuits.

• FINA Approved Swimwear. fina.org
• FINA Swim Cap Rules. swimming.epicsports.com
• hydrotherapy swim. spadelamare.com