A - Length:
Place the end of the tape beside the collar at the top of the tee (Highest Point Shoulder). Pull the tape measure to the bottom of the shirt.
B - Width: 
Place the end of the tape at the seam under the sleeve and pull the tape measure across the shirt to the seam under the opposite sleeve.
C - Sleeve length: 
Place one end of the tape at the top of the set-in sleeve, then pull the tape down until you reach the hem of the sleeve.

Size Length Width Sleeve
S 26 21 ⅝ 8 ¼
M 27 ½ 22 ⅞ 9
L 29 ⅛ 24 9 ⅞
XL 30 ¾ 25 ¼ 10 ⅝
Size Length Width Sleeve
S 66 55 21
M 70 58 23
L 74 61 25
XL 78 64 27
* Product measurements may vary by up to 2″ (5 cm).