I'm sure everyone has a story like this, but I was in the Army back when they had the green and black blobby camouflage, and we were doing a training exercise against some California National Guard unit. My squad leader and I were at a forward observation point, got bored, and decided to infiltrate them. We ended up behind their lines under some kind of evergreen tree with branches hanging to the ground, so a bit dark, but broad daylight otherwise. So some guy from the "enemy" side peeked underneath the tree, stared straight at us, not three feet away, then turned around and left. (Their side was wearing shirts inside-out so we could tell each other apart.) I guess I did my face paint OK that day.
Think - positioning rather than magic fabric. That's my interpretation anyway.