In a tree with little background and clouds, I wear snow camo, MossyOak snow. The white blends with the clouds, had deer look right through me. I do feel strange walking through the woods with white on though, so i usually pack it it instead. A hunter could probably see me better thatn the deer will in that. All being equal though, and a full checkbook, i would have a few different suits too. My "main" camo is a pair of sportsmans guide green bibs, MO fleece jacket and any of a number of hats. i do agree, movement when they are close, wind plays a big roll and you probably do not know how many deer spook from your scent because they are out of eyesight when they "bust" you.
Danbuck