Go for the 16/32 as that fits on you the sleeve and neck. As for the cut, that depends on your own style preferences. The slim fit garment size is 43 inches on the waist and the classic is 46.75. With five inches between your waist size and the slim fit garment size you should be fine. If the gap were to be below four inches then you are likely to see some bulging around the buttons when you sit down.
8/9/15 at 4:47am