Wooly Bear
We called the exterior jacket issued with the poly pro and Gortex system in the 80's the Wooly Bear jacket.
Kinda' looked like a black/dark brown sheep skin you could stick your finger down in. While warm as heck on it's own it worked best with the Gortex jacket to cut the wind.
Sounds like something similar.
There are lots and lots of warmies on the market today in many, many styles, weights and man made materials.
Most call the heavy ones "SpecOp weight" .
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