RE: If deer can' t see blaze orange, why do we buy camo?
It also depends on what you are hunting with. A deer is not likely to notice you in blaze orange coveralls at 200 yards with a rifle unless you move at the wrong time. However when you are hunting with a bow and have to be 30 yards or less, blaze orange coveralls (or any solid color) would be a disadvantage.
As far as all the different " name brand" kinds of camoflage, close your eyes and pick one, cause it don' t make a hill of beans difference.
I wear a blaze orange vest and hat any time I am hunting public land whether or not it is a requirement. I have been sitting in brush but in sight of animals many times with blaze orange and as long as they weren' t within " spittin" distance, I have never had one spook from wearing the orange. On private land, where I know where everyone is, I wear camo.