Original: 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 both men and women .
Simplified: A G-string or thong is a narrow piece of cloth or leather , or plastic that passes between the buttocks . It can be worn as a swimwear or underwear by both men and women .