Your coat size is determined by your chest measurement, height, and weight. Your pants are determined by your waist size and your outseam or inseam measurement (Your inseam measurement is how you usually purchase pants). Your shirt size is determined by your neck size and your sleeve length. Your vest size is determined by your coat size, waist size, and height. Your shoe size is determined by the size of your foot 🙂 We at National Tuxedo Rentals take care of all of this for you with the just simple information you supply us after the tuxedo build.