Last meaningful change in Army uniforms was when they dropped the Ridgway hat and then adopted the permanent dress fatigues. Veterans of that period said the only thing you could do
with a Ridgway hat was wear it, the permanent press fatigues were easier to wash and EM weren't being hassled and harassed over "breaking starch"-at their expense. Not that fond of BDUs, etc. Their camouflage value is "greatly exaggerated"-but they make it easier to hide a gut.
The permanent-press pickle suits were good for garrison
troops. If you were a grunt, they were awful. Front pockets
would load with sand or mud, depending on environment.
The civvy style zipper would lock up with grit, since it only
had a half-inch wide flap covering it. Exposed buttons on
shirt front caught every twig and vine.
The BDU's (in original weight) were hot, but a big
improvement over the pickle suit. Buttons were
covered, pockets had flaps to keep junk out, and
the button fly didn't jam with grit.
And there was no comparison between visibility, wearing
the straight OG, vs. woodland camo. You could spot guys
in straight OG in a woodline from a hundred yards. With
BDU's, easy to miss from fifty yards or less.