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An olive green flame-resistant long-sleeved undershirt with a nice and tall collar from the British Royal Air Force. You don’t have to own a fighter plane to wear these. They also work in other military use, hunting, hiking, and everyday activities. When you look at their properties, they are cheap because milsurp but clean and intact. So quite a catch because flame-resistant clothes tend to be a lot more expensive when new.
Features
Officially known as "Undershirt, FR, Light Olive for air crew". It is a long-sleeved shirt with a turtleneck collar. The thickness is about the same as an average t-shirt, and the collar is nice and high. The color is more greenish than brownish olive. It can vary a bit from shirt to shirt but not that much that it ruins your day.
Condition
Used British Royal Air Force surplus. These are in excellent condition. I guess you don’t sweat much in the air force. Clean and intact.