Sometimes we focus so much on what we can see from a stand that we forget to think about what the deer sees from his angle.
Whether you are hunting with a gun, bow or muzzleloader, you will almost always have to make some kind of movement to get your sights on a deer. While a whitetail's sense of smell is his best defense, we just can't ignore his sight and hearing.
Camouflage alone will not do the trick. Deer will key in on movement, so your best defense is a good set of camo AND some background clutter to break up your outline.
If you're hunting from an elevated position, try to keep a canopy of leaves between you and the sky. When hunting from the ground, leafy bushes or thick branches will do the trick.
Another thing to keep in mind is that the closer to you the background is, the harder it will be for a deer to pick you out against it, especially when your camo is suited to your hunting situation.