Chambray is an extremely versatile fabric. It can be worn to the office, onto the work site, mowing the lawn, out on the weekends, etc. Like denim it's kind of an every man, or woman, fabric, which I think make's it so appealing. The weight also tends to make it great for Spring/Summer and easy to layer up with for fall/winter....
Robert Redford in Chambray in Spy Game
Woody Allen in Chambray in Annie Hall
US Soldiers in Chambray during WWII
US Soldier in a cut off Chambray Shirt
US Soldiers in Chambray and Dungarees during WWII