Alright gang, it's my turn - I'm 6"0 and probably 165. I measured a Ben Sherman jacket that I love the fit of and pit-to-pit it was just over 22". I'm normally a 38-39 in suit jackets, etc. According to Oi Polloi, the 38 measures 21.5" pit-to-pit and the 40 measures 22.5" pit-to-pit. Is this accurate? I'd rather have a very fitted jacket than a loose jacket in general, but I'm not sure that this type of fit will work with the G9 Slimfit. Is there any stretching/shrinking that I should be at all aware of here? ...just looking for somebody to sway me either way. Thanks. If you have that Ben Sherman Harrington in medium, then in comparison, the G9S 38 is similar, but the shoulders on it are nearly too narrow for me, and the chest/body is a little bigger. If you have shoulders 18" or over, you probably shouldn't go smaller than a 38.