Okay, here's my twelve and a half cents.
I was in the US Army, before the changeover to the ACU (Army Combat Uniform), so all my stuff is in the old style cammo pattern. Which is why, for the undersuit, I prefer design two.
With that said, I really dig the heavy leg armor on number five, though I'm afraid the upper girth belt might cause you problems moving around, and might make you look like you have a belly as large as mine (I'm thinking of doing a Santa Mando....).
I also think that for the armor, your coloring on number two is a bit light. I'd darken it down a hair to the shade of the US Army BDU undershirts (t-shirts). But that's just me.
Good luck with the build, and as a US Army Soldier, let me just say "Hooah!".
