The challenge of camouflage is that a design that works perfectly in one context stands out like a billboard in another, an aircraft with brown & green camouflage does look like a flying tree at 20,00 feet. From the position of the Chicago Board of Trade position at Stones River where we do our artillery demos, the tree line where the Confederate infantry began their final assaults is about 800 yards away. I have often noticed that butternut uniforms are easy to see against the dark cedars. Once they moved into the broom sedge in the field, which is reddish brown, they are much harder to make out. On the other hand, against the dark cedar trees the counter shaded Union uniform of light blue pants & dark jackets disrupts profile. When we have done Signal Corps programs at Lookout Mountain, I have also noticed how the countershaded Union uniform made the figures hard to make out against the skyline. Camouflage does not need to make a man invisible, it only needs to disrupt his profile & make him difficult to target. That is how dazzle camouflage works. My experience is that the answer to the question of which uniform is the best camouflage is the dreaded, "It depends..."
The only service that made camouflage a priority during the Civil War was the Signal Corps. There was an understandable need to shield the signals from preying eyes & discourage sniping by by artillery. There really is a "Here I am please kill me!" quality about waving a flag on a battlefield, don't you know?
What is not generally understood is that signalists manned stations of observation. They were tasked with secretly observing enemy movements, intercepting "sigs for contrabands", i.e., intercepting & decoding enemy messages. Signalists also acted as forward artillery observers, routinely designating targets & adjusting fire.
Odds are that none of you all have ever seen this before. This is page one of the signal code used to adjust the fire of Porter's gunboats by signalist of the Army of Tennessee. From a hidden position, signalists used the Combined Service Code to communicate with the gunboats. During riverine combined operations, it is easy to understand how adjusting the fire of the gunboats would be a powerful force multiplier.