Underwear as fashion matured in the 1970s and 1980s, and underwear advertisers forgot about comfort and durability, at least in advertising. Sex appeal became the main selling point, in swimwear as well, bringing to fruition a trend that had been building since at least the flapper era.
The tank top, an undershirt named after the type of swimwear dating from the 1920s known as a tank suit or maillot, became popular warm-weather casual outerwear in the US in the 1980s. Performers such as Madonna and Cyndi Lauper were also often seen wearing their undergarments on top of other clothes.
Although worn for decades by exotic dancers, in the 1980s the G-string first gained popularity in South America, particularly in Brazil. Originally a style of swimsuit, the back of the garment is so narrow that it disappears between the buttocks. By the 1990s the design had made its way to most of the Western world, and thong underwear became popular. Today, the thong is one of the fastest-selling styles of underwear among women, and is also worn by men.