Our measurements are supplied by the manufacturers, and the sizes of the products can differ by up to 2 inches (5 cm).A useful tip! You can compare your own items at home with the sizes listed in this guide by measuring them.A LengthBegin at the collar on the top of the tee at the side closest to the neck (Highest Point Shoulder). Stretch the tape measure down to the shirt's bottom edge.B WidthStart the measurement at the seam beneath one sleeve, extend the tape across to the seam under the other sleeve.C Sleeve lengthStart measuring from the middle of the collar at the back, proceed along the top seam of the sleeve. At the shoulder, secure the tape and continue along down to the end of the sleeve.