Sizing Options
Use either your Standard Dress Shirt Size ("off the rack") which is your Neck/Sleeve size (e.g. 18/36) or you can can follow the instructions on our site explaining how to take your custom measurements. You can also use a "hybrid" method where you give us a standard size and tell us the "taper" you want to get dress shirts custom fit to your frame. See below for details.
Your Standard Size can be found near the collar on the label of an existing "off the rack" dress shirt, or on the inside panel of the shirt near the bottom.

Standard Dress Shirt Size