It's an Attolini 70/30 Cotton/linen blend with a very nice medium spread collar that I picked up for 100 dollars at a Domenico Vacca sale several years ago. Unfortunately, I don't know of any stores that carry Attolini shirts anymore (Bergdorf seems to have replaced them with Truzzi, and Vacca with Finnamore.)
Those shoes aren't Bally by any chance? I have a pair of Bally's in the same color. (I generally wear them with charcoal, but the lighter grey looks nice, too.) When I walk down the street, virtually everyone I pass is staring at my feet. I'm not sure that's a good thing.