What size plates do I need?

You can get a good idea of what size plates you need by measuring nipple to nipple and clavicle to the belly button. The purpose of modern body armor is to cover your vital organs, not your entire torso. You want plates that are large enough to provide adequate protection, but not so large that they restrict your range of motion.  

Attached below is the Plate Sizing Guide from Hesco for more information.