This Grateful Dead Golfer t-shirt is officially licensed and recently manufactured by Sundog.  These shirts are NOT vintage.  Both sides are screen printed on a tie dye t-shirt made from 100% cotton.  The length runs a little short on this shirt.  Especially the 2XL.  Please check the size chart.

Size,          Brand,        Armpit to Armpit, Top to Bottom
Medium     Sundog                 19"                   29"
Large         Gildan                   21"                   29"
X-Large     Gildan                   23"                   29"
2X-Large   Sundog                 25"                   28"
3X-Large   Sundog                27"                  31"
4X-Large   Gildan                  29"                  32"
5X-Large   Port & Company  30"                  33"