>>2706055>>2706050That's what I assumed, but given that the field test items are marked like you found it is still an oddity.
Here's the full jacket. The fabric is not 80/20 or if it is it has some sort of water resistant impregnation I'm unfamiliar with.
I found it on eBay from some generic second hand seller who had no other surplus, it was posted as "German army jacket" or something of the non descriptive sort.