This is going to sound like a lie, but I'll tell it anyway. I was hunting in the pine forest of eastern NC wearing a full orange sweat shirt. At some point I laid down on the ground and took a nap. When I woke up I had a doe standing no more than five feet away, looking at this pumpkin on the ground I suppose.
But, my common sense tells me that any animal will be able to see a large uniform colored object move easier than a broken up pattern, regardless of what color they perceive.