Zeltbahn, or shelter quarter, could be used as improvised rain poncho and as a camouflage clothing. Issued to everyone who served in the field practically, as four of these combined will make a tent of some kind, and even more combined... a larger tent

Also, it was practically the most common camouflage used by germans from beginning to the end regardless of service branch.
Practically I don't see any reason why you would use it manually, but seeing a soldier skin\model with that might be one possibility.