ONE OF THE FAITHFUL, subs. phr. (old).1. A drunkard. For synonyms, see ELBOW-CROOKER.
1609. The Man in the Moone. This fellow is ONE OF THE FAITHFULL, as they prophanelie terme him, said Opinion; no Heliogabalus at meat, but he will drinke many degrees beyond a Dutchman.
2. (common).A tailor giving long credit.
1785. GROSE, A Classical Dictionary of the Vulgar Tongue, s.v.
1859. G. W. MATSELL, Vocabulum; or, The Rogues Lexicon, s.v. FAITHFUL. A tailor that gives long credit. I say, Sam, what kind of crib was that you cracked? Oh! it belonged to ONE OF THE FAITHFUL.