ROYAL CANADIAN AIR FORCES GREEN FLYERS SHIRT 
SIZE 7640
MAY HAVE SIGNS OF WEAR OR FADING. 
How Canadian 4 digit shirt sizing works
*The first two digits indicate the approximate height of person in inches.
And the last two digits indicate the chest size in inches.
Size 7640
This shirt is best suited for someone approximately 76 inches tall with a 40 inch chest.