The most successful deer hunters don't wear camo at all. Mountain Lion attire doesn't look anything like what is on sale at Cabela's on any given weekend.
And yet...the Mountain Lion is the result of hundreds of years of adaptation. Its coat has adapted to give it the right amount of shading for its conditions.
However, if you wish, Tiger stripes work like camo, breaking up their pattern, as do Leopard, Cheetah, Ocelot, Jaguar....shall I go on? I think they're all very successful hunters in their own right. Sharks have a white underbelly so that when one looks up at them, it just appears to be sunlight.
Same goes for a large amount of birds...mourning doves and quail all have coloring that allows them to blend into their surroundings. Fawns have spotted coats to help them hide.