I finally got one of these in mint condition in a human size (Medium). I bet most of you reading this have no idea how hard it is to find original vietnam war items in common sizes like medium or large. Forget about anything bigger than size large in clothing. Oh you can find an endless supply of original still in box jungle boots if you wear size 6-1/2 or 14XXXNarrow.

Same with these night shirts, If you are the size of an asian 5 year old you are all set. The rest of us have to hunt hard. I got this one after many years of looking, More about what is called in slang terms the “jungle night shirt” from Vietnam Gear

Introduced in 1966, the olive green (OG-106) lightweight sleeping shirt was made from nylon and was lighter, quicker to dry and more durable than the wool sweater it replaced. It also provided some resistance to insects and mosquitoes. The new shirt was primarily issued to soldiers operating in the highlands of I and II corps, where the wind-chill was significant during the dry season.¹ Pilots in Vietnam continued to prefer the original wool jungle sweater due to risk of the nylon melting in a cockpit fire.