Faded camo?

[Bjorn]

Camo works really well for human eyes-that's why the military wears camo. For animals it is about breaking up the outline and not reflecting light. Like was said earlier movement is what gives you away.

[Dan bree]

Must be a lot of blue trees in the woods. !

[FXJr]

Dan, they see grey as blue and a lot of camo uses grey to help break-up the human outline.

[Gdpolk]

From all my research and I've done a ton what I've gathered is:

1) almost all camo is made to sell to people rather than being truly designed for concealment from animals (go figure)
2) any pattern that breaks up your outline is better than any pattern that doesn't (mossy oak obsession in a snow storm is a BAD choice while it in dense hardwoods bottoms may be a good choice)
3) any pattern with essentially the same brightness and general color scheme as your surroundings will work equally well (including plaids and what not)
4) how and when you MOVE is what gets you spotted the most (think how many times you see that solid brown deer standing still vs when it moves)
5) what material it's made of may make a marginal difference. Natural materials like cotton and wool reflect less light than polyester, nylon, and fleece. However this is a small thing.