I currently own a Levi’s Bunkhouse Chambray shirt and it is one of the most comfortable shirts I own. The material is light and breathable, with selvedge details along the lapel. I’d have preferred a slimmer cut, but a looser cut is what you get when you purchase a repro item. It is a limited edition and not available anymore, but you can get a gray version here, or the woolen version here.
Pics of the gray version from hanon shop.
I plan to buy a bunch more, and the following are currently on my radar.
Flat Head Red Chambray. Get it here (L/S). or here (S/S).
Woolrich Woolen Mills Trail Shirt. Get it here.
Kato Contrast Collar Chambray Shirt. Get it here.
Thanks to Jake Davis’ blog entry, I got myself the Koto chambray workshirt.