Nor metallic sounds, or plastic rain-coat on brush. Folding or shaking a cheap poly tarp can bring a bull moose in, and has.
On the other hand, it took Fish and Wildlife Service 12 years to locate my back in tarp camp, and then only because I rigged a blue tarp up across the entrance to intercept wind-blown rain. They spotted it from the air... Up 'til then, the brown worked just fine.. I've a new location and a 10X20 camo tarp now.....
So, is camo over-rated? It all depends....