I love CT shrits, especially the non-iron variety. Two things I've noticed about their shirts - the collars tend to shrink about half an inch, and the sleeves tend to be about an inch shorter than their US counterparts. So, a 16.5 34 might be the way to go and those are pretty proportional sizes. As a frame of reference, I'm 6'0 and 200 lbs with a 42" chest and 16.5/35 slim fits fit me perfectly. I can wear a size 16 shirt and it will look good but it can become distractingly snug throughout the day especially after a big lunch.