First, lets look at some inspiration from (who else?) Ralph Lauren's Spring 2010 runway. This was a strong runway show for him, very "Ralph" with the luxurious take on what you would usually consider working clothes. Not, 9-5 working, but actual "go outside and get your hands dirty" working clothes. Some examples:
I adore that beaded tunic/dress. Anyway, you can see what I'm talking about - fancy! Here is a sampling of chambray (and lightweight denim) shirts I ran across, you'll be seeing a couple of these later this week in various looks. Enjoy!
Runway images via WWD