You got a good point there.
For texturing the Guerilla Garment uniform, you need 2x textures. Position 0 and 1.
I recently tried it out, and used those two textures;
It seems like the Combat Fatigues or "U_I_CombatUniform" fits on the pants and shoes & the hidden texture "A3\Characters_F\Civil\Data\c_cloth1_v2_co.paa" fits on the shirt and scarf.
http://i.imgur.com/96RzQN8.png & http://i.imgur.com/DHJBsVk.jpg = http://i.imgur.com/4mL29ZN.jpg