I nearly always wear a size large shirt and sometimes a medium. I bought this in a large and it's so tiny! The shoulders are very tight and I could barely button it over my (very modestly sized) chest. I've ordered an extra large and hope it works, because otherwise this shirt is awesome! Great length,good profile, excellent fabric, good color (I ordered the Champion Chambray) and the prettiest black pearl snaps.
Edit: Received this shirt today (1.15.13) in an XL and LOVE IT! Very cute fit and high quality fabric. Make sure to order one size up for the Fall 2012 version of this shirt.
Fantastic button down shirt. Solid quality as expected from discrete and compared to last years product they have this version dialed. Also this shirt needs no ironing (not like I was going to) but it looks like new right out of the dryer. always a plus in my book. My only gripe is that this shirt runs 1 size too small. Make sure you order a size up.
I really want to love this shirt but the fit is pretty tight. I had to return the large for an XL and still its pretty snug on me. I generally wear L and go up to XL for some room. I am afraid to wash it cause i think it may shrink. Other than the fit, the material is good and love the pearl snaps.