Origin

G-string or thong is probably the earliest form of clothing known to mankind; having originated in the warmer climates of sub-Saharan Africa where clothing was first worn nearly 75,000 years ago. Many tribal peoples, such as some of the Khoisan people of southern Africa, wore thongs for many centuries. Much like the 2000-plus-year-old Japanese fundoshi, these early garments were made with the male genitalia in mind.
Although developed for the male anatomy by primitive peoples, in the modern West G-strings are more often worn by females. Female strippers and erotic dancers in the west have been wearing G-strings and thongs during their routines since the mid-1920s. They first gained mainstream popularity as swimwear in South America, particularly in Brazil in the 1970s. It was originally a style of thong swimsuit whose rear area became so narrow that it would disappear between the wearer's buttocks.