Tops size chart size xxvsxtsmxlxlxllltr, size3234363840424446 chest (cm)778185899397101105 waist (cm)6165697377818589 chest: Place the tape measure at the widest point on your chest, and measure for your chest circumference. Waist: Put your hands around your waist. The point where your hand is at your waist. Measure around your waist there. You have to be careful not to slide it parallel to the ground.