Most of the camos and uniforms look like "photographed.
What is the best way to use a new uniform ,lets say e.g. snow camo instead the default digital woodland camo.
The quickes and simplest way ( now you have pathed to a new texture) is to convert that paa to tga using texview2
open it in photoshop or Gimp etc , crate a new layer from background , hide back ground layer and work on new layer,
make this greyscale , then filter sylize find edges (save the psd for future ), then unhide the original background layer and make the new edges layer opacity less than 100, till you can see the original pattern underneath.
Erase as required in your new layer and shade it as necessary to your desired colour , this will all take time and practice, eventually you will be able to find time to make the process so good you can actually make a stitching and accessory template like e-bud once did for arma2 .
anyway when your happy with new pattern/camo etc merge visible and have a go in game.
thats how i do it but i gotta say i am shit at texturing