undercovering
nounEtymology From under- + covering.
1
A covering that goes under something else.
- At the moment of the killing, the black fabric covering the rotating platform is stripped off by some of the ever-present gremlin people to reveal blood red undercovering.2009 October 9, Anthony Tommasini, “Family Dysfunction Bathed in Cosmic Neon”, in New York Times: