Raincoats are very useful Wear-Items, where it seems to rain 22 Hours a day on some Servers, but bright yellow, orange, etc. are horrible Colours, when it comes to avoiding enemy Spotting. The Surface of GoreTex-Raincoats or Working Helmets would surely offer a good Spraypaint Foundation in a real Life Apocalypse, too. This Camouflage-Feature should not be limited to Rifles, Firefighting Axes and Motorbike-Helmets. Even Backpacks could be much less glowing over Kilometers when spraypainted, but that's just a bonus thought.
Adding other dark Spraypaint Colors like dark Brown or Grey could vary the look of camouflaged Survivors, too.