There are many hidden textures for many of the uniforms in the game that I and many others feel should be relased as their own uniforms.
Some of these include the woodland and sage texture for the nato uniform, the syndikat texture for the AAF Fatigues and many many more.
Having these as their own uniforms would bring a lot more variety in the game in the way of uniforms which would help those who like to make missions as well.
Links to a selection of hidden textures:
Many of these are fine textures that have been removed/hidden for unknown reasons even though most of these look great.