My 20-year old Pop's Leather G-1 (minus pussy pelt collar) with no epaulettes, pen pockets, wings, 'I love F-14s' patches or similar is getting pretty battered, but is great for roof-down driving, flying etc.
Rather comfier than the Aviation Leathercraft 'official' RAF jacket, which is cut rather too long for most people.
Unless you're flying an open cockpit aircraft, a replica Irvin jacket is rather de trop, to my mind.