Does anybody know of an online source for original or reproduction US Army twill khaki shirts like the wore during the Vietnam era?

I've been on ebay and they have several, but they all seem to be size small or medium...and they are varying degrees of stained/worn, etc. with patches sewn on that may leave marks that won't come out. I also check out police uniform sites and have yet to find what I consider an acceptable alternative.

Here's what I'm looking for:
  • Khaki/Tan
  • Short sleeve
  • Cotton/Polyester Twill (herringbone or otherwise)
  • Epaulettes
  • Two button-down flap pockets (either single point or mitered corner)
  • Size Large (16.5 neck, 22"/22.5" armpit to armpit)


Any suggestions/help would be appreciated!