The measurements in the guide are based on measurements taken directly from the body, not the actual garment.
Chest - Measure the circumference of your chest. Place one end of the tape measure at the fullest part of your bust, wrap it around (under your armpits, around your shoulder blades, and back to the front) to get the measurement.
Waist - Measure around your waist, just below your naval.
Neck - Measure around the base of your neck where your collar sits.
Sleeve - Measure from the base of the center of the back of the neck and run the measuring tape over your shoulder, and let it hang down to your hand.
* If your measurements lie between two sizes we recommend you select the smaller size in both classic and casual shirts.