I am sort of a gear-a-holic, so I have tried a lot of the stuff out there, always with an eye out for good sales, kept some of it, passed some of it along. The new stuff is all pretty amazing, and beautifully made.
Sitka, Kuiu and First Lite all are high end in quality. I have a few lesser items from Kuiu so I am less informed about their clothing, but over the years I have had a number of Sitka items, most recently their Stratus (windproof)line, and several First lite items including a Chama Hoody, and an Uncompaghre (SP?) jacket, both of which are totally well thought out and useful over a wide range of temps.
In my experience, the fit is narrow on all, so just go up a size and you will be comfortable, with room to layer. When warmth is needed, by which I mean sitting for a few hours in single or low double digit temps, I am back in my wool stuff, either KOM or the now-defunct Sleeping Indian. Both are exceptional in their ability to keep you comfortable in cold weather.
You have to consider the camo patterns, too, and Kuiu has some good ones. The new Sitka elevated pattern is also excellent. My 2 cents. PS they are just as comfortable as cotton blends in the right temps.