made out of whole cloth

made out of whole cloth

Entirely fictional or utterly false; completely fabricated and not based on reality at all. A reference to tailors who would falsely advertise garments being made "out of whole cloth," when, in reality, they were pieced together from different cuts. To be honest, I don't believe a word he says—it sounds made out of whole cloth to me.
See also: cloth, made, of, out, whole