measurements in inches:

 

  0 2 4 6 8 10 12 14 16
  XS S M L XL
NECK 13 3/4 14   14 1/4 14 1/2 14 3/4 15   15 1/4 15 1/2 15 3/4
YOKE 13 3/8 13 3/4 14 1/8 14 1/2 14 7/8 15 1/4 15 5/8 16   16 3/8
CHEST 29 1/2 31   32 1/2 34   35 1/2 37 1/2 39 1/2 41 1/2 43 1/2
WAIST 25 1/2 27   28 1/2 30   31 1/2 33 1/2 35 1/2 37 1/2 39 1/2
SEAT 31 1/2 33   34 1/2 36   37 1/2 39 1/2 41 1/2 43 1/2 45 1/2
SLV. LENGTH 30 1/4 30 1/2 30 3/4 31   31 1/4 31 1/2 31 3/4 32   32 1/4
BODY LENGTH 23 1/4 23 1/2 23 3/4 24   24 1/4 24 1/2 24 3/4 25   25 1/4
CUFFS 8   8 1/4 8 1/2 8 3/4 9   9 1/4 9 1/2 9 3/4 10