Just as long as you can sit still or move very slowly. Deer wont be able to distinguish you from a tree or rock if you sit still but if you move they can pick you right off, and then it is bye bye. It doesnt matter to me what camo I use. All I do is sit fairly still, move little when I see a deer coming, and dont make any sudden movements.
As for the scent business, I've never really saw much of an affect with that. I mean I use some scent elimination stuff now and then and keep my clothes in a plastic bag with some pine needles, but I just dont go to the extent that I know some people go to.