I'm late to the party on this one but managed to find this in stock in L size at Rivet & Hide, most places seemed to be low on stock at this point. Anyways posting to share my fit and see what the experts think.
I was a little worried it was going to run a bit short in the chest. It's a little snug across the chest when buttoned, but the fabric is not too unforgiving and overall feels quite comfortable. I can still button up the jacket with a heavy flannel underneath and it's not uncomfortable, just enough room, and with a tshirt there's plenty of wiggle room. It seems like length to waist is about right (sits just below jeans waist line), and arm length is bang on (maybe a cm too long, but perfectly fine). Sizing up would have certainly meant the arms would be too long, so I reckon this fit is exactly right from the available sizes in this jacket.
Please excuse my pairing with cheap stretch jeans, I'm workin' on it
Also Ross from Rivet & Hide did me a solid and measured this before sending out, which confirmed it ran slightly bigger than their listed chest measurement and gave hope that I'd squeeze in. I've had great experience with R&H and IHUK so far, top work.
I think you can see it runs a little snug across the body / chest when buttoned up, though sizing up would probably be too big I reckon. Certainly too long in the arms. Probably better to be slightly snug than baggy. What do the denim sages think?