The full monty (or the full Monty) is a British slang phrase of uncertain origin. It is generally used to mean "everything which is necessary, appropriate or possible; ‘the works’". It has been in common usage in the North of England at least since the early 1980s as the 1982 Yellow Pages for Manchester lists fish and chip shops called the "Full Monty Chippy" and the "Fullmonty Chippy". A US equivalent might be the phrase "the works", "the whole nine yards", "the whole ball of wax", "the whole enchilada", "the whole shebang" or "the whole hog".
Possible origins of the phrase include: