Green’s Dictionary of Slang

(US teen) nickname of the Conti Cardigan (created by an eponymous Greek clothier) and one of the preferred garments of members of sharpie n.² gangs c. 1970.

2004

(con. 1960s-70s) T. Taylor Top Fellas 45/2: Originally sharps bought their Connys off the shelf, but pretty soon kids started brigning i their own designs, sparing no expense to wow their mates.