I would like to start by saying these are very high quality shirts, the material and construction seem very good. Size wise - I'm 6ft 2in, bust 38, neck 15.5, sleeves 35, which according to the size chart should put me at the top of average, so I went for medium, slim, which is what I always do buy shirts. I ordered two of these in this size. The first one I tried on was absolutely perfect, I was thrilled to finally find a polo shirt that fitted well and wasn't baggy. I tried the second. and it was HUGE. I checked three times that it is the same size as the first one, both are medium slim. The second was not slim like a big one. were huge. I think I might try the little ones, which I never order, but like I said, they're well made, so I want them to work.