Vintage 60s-70s green long sleeve military button up two pocket twill uniform utility shirt with gas flap. Tagged size 15 1/2 x 32. Am uncertain of precise era or military branch. 

measurements:
  • shoulders -- 16.75"
  • neck -- 14.5"
  • chest -- 43"
  • waist -- 41"
  • sleeve length from shoulder seam -- 22"
  • total length -- 31"