Thanks for your replies.
Would you say the Mackinaw is sort of menswear compatible?
So say I take a 58 in Italian or a 56 in German a XXL would be fine?
I'm currently looking alternatives to Barbour and have always had an eye on Filson, the tin cloth field jacket and the cover cloth mile marker coat in particular but the question is if these work outside an Americana/workwear context.
The single Mac fits solidly in the streetwear & denim workwear niche, which is why Filson created the Seattle fit for iGents and neckbeard lumbersexuals who would have to size down sometimes 2 sizes to get their "fit" dialled in because they don't use it over multiple layers. Seattle fit is more tapered through the body, especially the waist.
The Alaska fit is built to accommodate multiple layers because they are needed for cold weather. Even though it is relatively heavy wool, a 24 or 26 oz wool overcoat is really not that warm relatively speaking.
I've always sized down 1 size with the single Mac and go TTS in the double Mac. The double is actually slimmer than the single Mac in the Alaska fit from a chest tolerance perspective. Or maybe I should say less large.
I actually dislike the design of the single Mac compared to the double Mac, mainly because of the pocket orientation.
Single Mac. Don't like the 4 pocket array although the back is pretty clean except for the map pocket dual entry pockets on the back
Double Mac. I find that the double layer of cape over the front gives a cleaner look hiding the full upper pockets under the cape. I also think the cape over the back looks better. Problem is it is a heavy behemoth of a jacket that - despite it being used by hunters and loggers - really needs layers beneath to be truly warm.
I think an alternative if you want a wool filson coat that combines the best of both the Mac and double Mac is the Cape Coat. You get a cape over the front and back but not the double sleeves that come with the double Mac. You also have side entry, handwarmer lower pockets instead of flaps. Plus you have a clean back with the cape treatment and no map pockets flaps.
The unlined Cape coat is the same 24 oz/square yd in solid colours as the single Mac and both use 26 oz for the plaid. The Cape is warmer. You can also get it lined in a sherpa lining with Primaloft Gold synthetic insulation but with a 21 ounce wool, making it warmer than the single Mac for sure. Have no first hand comparison to the double Mac but I'd say it may be as warm.