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jb pretty much covered everything, but as a slight add, a good shout would be to keep an eye on here if you're not already:
https://www.marrkt.com/collections/all-outerwear
they have quite a constant flow of workwear faves turning up, you might get lucky.
having a quick google about ironheart seems to have discontinued theirs but it looked good and they're usually cut a bit wider or at least have a very broad size range
Not even sure it was this thread, and sorry for the dredge, but who makes your favourite N1 jacket in a non-slimmed style? I know @JB had some ideas. Doesn't have to be N1 specifically, but it needs to be short, warm, natural materials and made with more attention to quality than price point.