I think your most recent coats have much wider lapels. I would scale it back a little, at least to 4" and maybe add a bit of shoulder extension if you think your shoulders are too narrow. You could probably get away easier with wider lapels if you do a 3 button coat with higher lapel roll. Just a thought.
I read that it is lined with titanium so probably more durable. I hope that straps can be bought separately at reasonable price, would be cool to switch up to rubber in the hot months.I'm torn on the YM, I can't decide if I love it or hate it.
Depending on gorge height, I would go from 3.75 to 4" but no more than 4. You can get away with wider lapels with higher gorge, I've been happy with 3.75" on lower gorge coats. Is that 4.5" on the gunclub?
how do the Niche sweatshirts fit? For reference, I would be XL in Merz sweatshirts. Should I go with XL in Niche as well? It says they fit large but not sure what that means within the context of Niche.