In theory, the orange camo would seem the best to me. But I'm in the camp that says your movements are much more important than the clothes you are wearing. A month ago, I sat really still and got a fawn to come about ten feet from me before she noticed my presence. I was wearing jeans and a white t-shirt.
I do wear camo when hunting (most of the time), but I doubt the effectiveness. But, as nico said, it can't hurt.