I'm 5'9", 145 lbs, and wear a Small in basically any kind of shirt. I got a Small, and it fits me well. Not extremely slim fit, but not boxy. I'll be able to wear a thermal comfortably underneath. It has a square hem that comes down a couple inches below the waistline of my jeans, which I wear on my hips.
There are a couple neat details. The top button doesn't have a button-hole, but has a loop closure. Also, I don't really know how to explain this, but the buttons lie almost flush to the shirt when the shirt is buttoned.
It's supposedly "washable wool," but I'll probably stick to dry-cleaning. My raw denim experience has inoculated me against any fear of not washing things for long, long periods.http://www.pendleton-usa.com/jump.js...iProductID=361
The shirt that the douche with the guitar is wearing is the color I got. Mine is not as (douche)baggy as his.