I saw muscle mags ran adverts for achieving Arnold's 60 inch chest back in the day. His chest was huge and immense and even today stood next current bodybuilders you can see his chest region dwarfs theirs. 57 was easily possible.
Way out of retirement and slimmed down a TV presenter visited arnolds tailor and tried Arnold's suit jacket on, it literally hung off this average guy and he saw Arnold's measurements, 36 inch waist, 50inch chest. He held is trousers up next to him and they were crazy long like he had supermodel length legs. Guess that adds up coz of his relatively short torso