I'd say more than a few years ago. I remember one of our lads(late eighties) wandering around Hohne tank park, winter time in something similar, I was wearing a set of German overalls that had the fleece lining.Brilliant for those cold winter mornings, when the rest of The LAD were trying to motivate themselves, as it was so cold.
Still got mine, you can unzip the bottom bit, fold it up and use the bag like a big warm comfy jacket. Rex's dangly bits for radio stag. Also waterproof. Smart bit of kit but not quite as warm as ours in really cold weather.
Only the Nips could invent one with legs and no arms.