OK I got mine today (very fast priority mail delivery!). They do run a bit slim. I bought a 15.75 (40) blue striped cotton/linen blend; the shirt is BEAUTIFUL, and as-is barely fits my barrel chest. I'd say it'd be perfect for someone who wears a 40, or 42, US-size jacket. I'm a 44 reg and worried that once it's laundered it'll be too slim for me, so if anyone had their eyes on this I'd be happy to re-sell, shipping paid by me.