cloak 
(klōk)
(klōk)n.
1. A long, loose outer garment, usually having a hood and no sleeves.
2. Something that covers or conceals: a cloak of secrecy.
tr.v. cloaked, cloak·ing, cloaks
To cover or conceal with a cloak or something that acts like a cloak: mist that cloaks the mountains. See Synonyms at disguise, hide1.
[Middle English cloke, from Old North French cloque, cloak, bell (from its shape), from Medieval Latin clocca; see CLOCK1.]