Check the charts below for your size.

Men's Body Measurements (in inches)
Size S M L XL XXL XXXL
Neck 14-141/2 15-151/2 16-161/2 17-171/2 18-181/2 19-191/2
Chest 34-36 38-40 42-44 46-48 50-52 54-56
Waist 28-30 32-34 36-38 40-42 44-46 48-50

Arm

("Tall": add 2")

 32-33 33-34 34-35 35-36 36-37 37-38
Height Regular:
5'8" - 6'1"
Tall:
6'1 1/2" - 6'4" (measures 2" longer)

Women's Body Measurements (in inches)
Sizes XS S M L XL XXL XXXL
2 4-6 8-10 12-14 16-18 20-22 24-26
Bust  32  33-34  35-36  37-39  40-43  44-48 49-52 
Waist 24 25-26 27-28 29-31 32-34 36-38 41-43
Hips 34  35-36   37-38  39-41 42-45   46-49 50-54 
Adult Hat Sizes
(in inches)
Size XS S M
  61/2 65/8 63/4 67/8 7 71/8
Head 201/2 203/4 211/8 211/2 217/8 221/4
Size L XL XXL
  71/4 73/8 71/2 75/8 73/4 77/8
Head 225/8 23 231/2 237/8 241/4 245/8