just thought I would mention it even though it's strictly a s/s item, as I know a few appreciatte the item - there is a khaki birdshooter in S on ebay.co.uk for a very reasonable sum (not mine btw).
I originally thought that the grey CPO was better, but after looking at the pic of that guy wearing the brown one in the page before, I'm now thinking the brown might look better than the grey.