Drop is the difference between the chest size and the waist size. So your example would have 34" pants. A 6" drop is pretty standard. Slimmer suits might be 7 or 8, and typically as suit sizes go up, the drop decreases. As an example, I think JAB has a 4" drop for size 48 and above.Roll is for three buttons and refers to what button it buttons to. 3 roll 2 means it is meant to be buttoned at the middle button only, so it looks like a 2 button.