I recently looked through the files and I found Woodland and Sage variants of the NATO uniform. I've also seen 2 extra pairs of the NATO clothing with classnames like such:
U_B_Combatuniform_wdl
Unfortunately however, when you equip them you'll just wear underwear instead of the clothing.
The camo swatch for their woodland uniform is from this site: http://bgfons.com/download/782
Likely the reason why they are not releasing the uniform proper, they don't have a camo sample of their own.
The texture is also not very finished, it's not even trimmed at the seams of the uniform. It may have been a test sample from earlier in development left in the files. Maybe a cleanup is in order?