That looks good for me, although tall, slim folks will surely disagree (and I would agree with them).
We are much closer now to a vintage "cowboy jacket" fit, but the only real way to address the length issue is to either produce "regular" and "long" versions, or to allow folks to specify their individual preferences. But then, I guess we would be getting close to MTM, which would surely increase the price.
We seem to be missing a size 42 - surely a pretty popular size. Pit-to-pit would be 23" and an 18.5" shoulder.
And this applies to ALL the denim stuff, not just the jackets.
The stuff Simon is using is Sanforised, and as such, in theory, will NOT shrink.
However, my experience of Sanforised denim, particularly Jap stuff, is that it WILL have some shrinkage.
A cold soak (which any denim should have) could cause a little, and washing at any temperature other than cold will almost certainly cause some.
Now the nature of the stuff is that it will then stretch back to its original size with wear, but bear in mind it will only stretch back where it is stretched - i.e subjected to stress.
Which means waistbands on jeans, say, will stretch (because your gut is pushing at it), but lengths of garments, and sleeves, legs, etc., (which get no stress) will remain at their shrunken size.
So maybe best to bear that in mind if a sizing is close to the max you require.
I could of course be wrong - maybe Simon has done some washing tests, and I might be talking complete bollox.
All denim is going to be raw, it was raw back then and I see no reason why we are not using it now. So prepare for roping, twists, threads biting into seams. We have factored in shrinkage, so order your true size, on orders add an extra inch on the leg, since it shrinks the most. But the waist and body and sleeves are all good.