strip of cloth passed from front to back between the legs, attached to and supported by a cord or band around the waist
A g-string is a narrow piece of cloth or leather that passes between the legs and buttocks and is attached to a band around the hips, worn as a bikini bottom or as underwear. The backside consists only of a string band.
Man wearing a red G-string
Woman wearing a pink G-string
Man wearing a red G-string (left image). Woman wearing a pink G-string (right image)
Man wearing a red G-string (labelled left image). Woman wearing a pink G-string (labelled right image)