I can see deer all the time, even from long distances in open areas and when standing still. Their "camouflage" doesn't work very well a lot of the time. I don't often see hunters in those situations when they are wearing good camo patterns. I understand that movement is the key element in being spotted by animals and other humans, but in my experience animals do not see us as well when we are properly camouflaged even when we move some. They seem to see us more when we don't blend into our environment even if we don't move. I won't argue that camo is needed all the time, especially with animals who are not often exposed to humans, but I think it is almost essential in some hunting conditions, especially around animals that get a lot of hunting pressure and learn what a human shape looks like where the hunter is sitting in the open. On the other hand, much of the camo on the market blobs up when looking at it from more than a few yards away and gives no significant advantage over solid colored clothing and may be worse than solid colors that are the same darkness as the surroundings. Good camo works well, which is why people have been using it in one form or another for millenia and is why some animals have developed camo patterns of their own, like the zebra, leopard, chameleon, insects, fish, etc.
Allan