That's nice.
Andy, I see which cammo smocks you mean now. It's possible that the sleeveless ones are supposed to be zeltbahn, which was a camouflaged, poncho-like affair, to be used as a poncho, and a shelter. These could be worn as shown in the diorama, or as a regular poncho, with the belt etc holding it all in place. By joining four of these together, a small, pyramid-type tent could be made too.