weapon skins, armor, and armor skins

Hi guys i thought that with all the new stuff coming out it would be nice to have some clarifacation so tell me what you know and what you have heard!!!

so far ive been informed that the colors schems that you see on all of these armor skins can be changed to your likeing so for say the forest skin it will still be the leaf patern but you change it to say black and sage gren like camo

i would like to also know if anybody knows if skins are armor specific of across all armors and if weapon skins can change colors and go across all guns