I just moved back here from NYC, more or less people would rather just wear a black cashmere coat meant for short trips, in/out of cabs, trains, or subways. I rarely saw anything of substance, let alone Canada Goose. It has nothing to do with wearing one layer (jacket) and has everything to do with being stylish. They'd die in this weather with their paltry coats.
On average MN's one of the most fit states (5th), NY isn't even on the list. So yeah, your "fatty" argument is a bit of a false narrative (Depending on the list). The shape has nothing to do with it, the practicality and affordability has far more to do with it. Even in the west suburbs, north oaks or mahtomedi, you won't find anything much different
Sure, high-end clothing isn't that popular, but that's the midwest for you, people don't give a fuck. There isn't a Thomas Pink here and there's only a couple BBros or other boutiques or nicer places in edina. It's what you get for living in a more modest state that cares more about being outside than being a fashionable metrosexual.
Personally, I found the whole "east coast badass" schtick boring and sophomoric. I still deal with a lot of NY'ers and the feeling remains. The one thing I give them is certainly better restaurants.