CUFF MEASURING
The best method we've found for getting your perfect cuff size is what we call the "Cardboard Test." Find an empty cereal box or pizza box (non-corrugated) or similar material like a soda bottle or any sturdy material you can use to cut out a strip. Cut it to basically 1/4" wide and a little longer than you think the cuff should be. You can tape pieces together if have to for added length. Then tape it around your neck end to end. If it's too big cut it down a little at a time until you get the fit you think you want. Wear it for a while (at least an hour or two or more) so that you can get an idea for the feel. Then when you find the right size, measure it and that is the total size of your collar (including the lock). This works 99% of the time it's much better than guessing.