I don't hunt, at this point. Want to though. This is a good thread. Years ago, during the first 4 or 6 years of my career, I was stationed with some Vietnam vets. A couple lessons they taught me from their time stuck with me. Two of the ones applicable here were about a military poncho. They have snaps all the way around the edge. These are supposed to be for a liner. Snapping a liner into it, makes it decently warm, if you need the insulation. It'll cover most people down to the knees, or a bit further. With the liner, if you don't have a tent, and need shelter, you can just lay down and wrap yourself in it. You can use 2 3' long sticks and 4 6" sticks (tent pegs) to make an open ended tent out of it. And the other part... the snaps line up perfectly with the snaps on a "2 man" military pup tent, and adding 2 ponchos to this tuens it into a nice spacious tent for 3 men and their gear.
If you are doing spot and stalk, the poncho may work for you to keep moving, depending on the terrain you are in. If you just hunker down for the brief shower, then it would be about perfect, in my opinion.