Camo-cloak
From Warhammer 40k - Lexicanum
A Camo-cloak is a cloak weaved for its durability and ability to help hide the wearer. They're commonly used by the Tanith First and Only, a.k.a. Gaunt's Ghosts. Commissar Ibram Gaunt was awarded with one of these by the soldiers of the regiment.1 They are also used by Space Marine Scouts. An example of this is given on the world Pavonis where Camo-Cloaks save Sergeant Learchus and his Scout Squad from being discovered by Tau paatrols.2
The Camo Cloak is coated with an absorbent material called Cameoline which takes on the colouration of the surroundings giving the wearer a great deal of individual concealment and when used by elite stealth experts such as Chief Scout Sergeant Oan Mkoll can give the wearer near perfect concealment.1
