Bought a medium
For anyone who's wondering, I'm usually a large but I Really really wanted this jacket (from here on out it's a jacket, because it's pretty warm, which is great).
I'm usually a large, but I got this in a M because that's all they had. I'm 5'7" and now 170 lbs and it fits, though not quite like the model in the picture. That's okay though, because I'm losing weight and it still looks good.
It's a little loose up top and the collar stays up a bit, and it's more fitting on the bottom half. Definitely love this shirt, I'd recommend it to someone who had the kind of money to spend on it.
Too warm for summer but perfect in cooler weather
When I read buttondown I thought this was going to be more of a thin, flexible material but it is more like a leather jacket. I am not unhappy with it as it certainly feels posh and nicely sewn, I will just wear it at a different time of year. I don't think it breathes at all.
The XS fits perfect in the shoulder, but it is a bit of a looser fit everywhere else. I would have liked the sleeves to have more of a slender fit. This feels like it would be a great item for layering once the weather cools.