It should have a 50" chest. My 50R has 18.5" shoulders -- or about .25" less than my Oxxford Manhattan model. I find that Isaia, for a "slimmer" coat, actually has a pretty large chest measurement in order to provide a bit of "swell." But the shoulders are a touch narrow. Does your Canali 56R fit you well in the shoulders? Could you go a touch narrower?