Slip it in a sling
8 TRIANGULAR BANDAGE
You’ll need a sling to support a broken collarbone or arm and keep everything in place. The easiest way to devise one in an emergency is by means of a triangular bandage. Simply let the injured limb lie in the middle of the bandage and tie a knot behind the person’s neck with the two corners.
go! Drive & Camp says You can also attach the sling to clothing with safety pins. >