You are a man of Duresley, i.e. a great liar and cheat. Duresley is a market-town in Gloucestershire, famous for its broadcloth manufactory. Now called Dursley. (See Fuller: Worthies.) The word “cabbage,” connected with tailors, seems to confirm the notion that our forefathers had no very high opinion of their honesty.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894