A G-string (alternatively gee-string or gee string) is a type of  underwear, a narrow piece of cloth, leather, or plastic, that covers or holds the genitals, passes between the buttocks, and is attached to a band around the hips, worn as  swimwear or underwear by women and men. It is also a style of thong swimsuit whose rear area can become so narrow that it would disappear between the wearer's buttocks. The two terms G-string and thong are often used interchangeably; however, they can refer to distinct pieces of clothing. A G-string is one variety of thong. See the design and variety of thongs for details.