PLUMAGE
feather, plume, plumage
(noun) the light horny waterproof structure forming the external covering of birds
Source: WordNet® 3.1
Etymology
Noun
plumage (countable and uncountable, plural plumages)
(ornithology, collective noun) Layer or collection of feathers covering a bird’s body; feathers used ornamentally.
Synonym: pennage (obsolete)
Finery or elaborate dress.
Source: Wiktionary
Plum"age, n. Etym: [F., from plume a feather.] (Zoöl.)
Definition: The entire clothing of a bird.
Note: It consist of the contour feathers, or the ordinary feathers
covering the head, neck, and body; the tail feathers, with their
upper and lower coverts; the wing feathers, including primaries,
secondaries, and tertiaries, with their coverts; and the down which
lies beneath the contour feathers. See Illust. under Bird.
Source: Webster’s Unabridged Dictionary 1913 Edition