The quality of this coat is superb: fantastic materials, great details, and functionality that’s hard to beat.
A few fit notes that might help others: I’m a slim-to-average build (40" chest, 36" waist, 6'3" tall) and usually have no trouble with off-the-peg clothing, but this one didn’t quite match my shape.
I tried both Medium and Large. The Medium was a bit snug (but acceptable) in the shoulders, yet far too tight in the arms, only a T-shirt would fit underneath. The Large fit comfortably in the shoulders, but the arms were still snug, meaning you have to hold onto long sleeves when putting it on to prevent them rolling up. Not a deal breaker, just a little annoying. The bigger fit issue (for me) is how generously the coat is cut around the chest, and especially the waist relative to the arms and shoulders. From the side, it can make you look like you have a bit of a belly. Tightening the waist adjuster helps, but it leaves long dangling elastic and creates a pronounced hourglass shape, which isn’t my preference, I find straighter lines more flattering. Photos attached for reference.
Another consequence of the wide hem is that it lets cold air flow up into the jacket, compromising warmth somewhat, which is a shame. Perhaps adding an adjustable hem could help block drafts on colder days?
All that said, the jacket is so well made that I’ve kept it anyway. I’m planning to see a tailor to refine the fit and remove some material to prevent uncomfortable bunching when sitting. Once that’s done, I’m hoping it will be the perfect winter coat for me.
Finally, a big thank you to Clive in customer service for the excellent help. I’m now looking for another Frahm that might be a better fit off the peg.