Thong
From Tardis Wiki, the free Doctor Who reference
Historians who had been allowed access to the "Monster Vaults" of the databanks in the Doctor's TARDIS observed that the Abzorbaloffs of Clom naturally wore little more than a thong, as the drawing of sustenance through their skin required them to be as naked as possible. (PROSE: The Monster Vault)
The Eleventh Doctor refused to wear a thong, again, for his date with River Song on Temple Beach. (PROSE: A Gamble with Time)
