From Latin balteus 'sword belt,' which Varro says was borrowed from Etruscan.
A strip of leather or other material worn around the waist to support or hold in clothing.
From Old English belt, borrowed early from Latin balteus 'girdle, sword belt.' The Latin word is of Etruscan origin according to Varro. It entered Germanic languages before the Anglo-Saxon migrations to Britain. Key roots: balteus (Latin: "sword belt").
Varro, the Roman scholar, explicitly states that balteus is an Etruscan loanword — making 'belt' one of the few everyday English words with possible Etruscan ancestry.