^ I've got the short collar moto size 48 (M) from last year and it is pretty snug. I think it's like 39" chest, 16.5" shoulder. I can just wear a tee underneath. I tried an Intarsia in size 50 (L) from this current season and it was only a little bit larger.
I can't remember where I found this, but I like it. Don't think I'd wear a suit and tie underneath though.