G-strings were a revealing type of clothing known to have been invented by the Human civilization of the planet Earth.
History and specifics[]
The Deltan Duo wore a matching set of G-strings displaying the Starfleet symbol on the occasion of their erotic performance at the Flag and Grog in 2293. (TOS novel: The Fearful Summons)
Ensign Sara George flung her G-string at Tram Bir in the middle of her strip tease on Kyros. (TOS novel: Spock, Messiah!)