The "concept" of camouflage was to break up your outline and make you less visible to those that may want to see you. Camo can be as simple as wearing clothing that is somewhat the color of the back ground, to wearing clothing that exactly matches the background. I use the term clothing to mean nearly anything including a couple leaves if that turns you on.
Problem is... there is no one size fits all camo currently available.
As above, there are several schools of thought.
Some say, just wear plaids or similar designs of dull (not shiny) earth tones and move slowly. I agree to a point.
Others say you need large patterns that break up your physical body pattern, even if it doesn't match the background color per se, it makes you look less like a human and more like nothing special. (Predator, ASAT and the like) I agree a lot.
Still others like the myriad of special designs that nearly perfectly match specific backgrounds. My problem with these is that they are now typically darker, and they match ONLY those particular backgrounds.
If an animal just "shows up" and sees you hiding in these sort, they may not see you at all. If, however, they see you moving to get to a hidey place and that dark blob which dissapears against a tree really stands out against the grass, they may not ever just "show up"
The bottom line ? Who knows. Wear what makes you feel good. Don't move quickly.
Shoot straight
ChuckC