This Grateful Dead Flip Letters 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 shirt normally reads Grateful Dead but upside down it reads The Other Ones as pictured.

Size,          Brand,        Armpit to Armpit, Top to Bottom
Small         Sundog                 18"                   25"
Medium     Gildan                   19"                   29"
Large         Sundog                 21"                   31"
X-Large     Gildan                   23"                   32"
2X-Large   Sundog                 25"                   32"
3X-Large   Gildan                   27"                   33"
4X-Large   Sundog                 27"                   35"