Green’s Dictionary of Slang

of uniforms, camouflage, thus n. a camouflage-pattern uniform.

1972		Morn. Call (Allentown, PA) 28 May C11/8: If you must camouflage the bow, use either camo tape or camo paint.
1987		(con. 1967) Bunch & Cole Reckoning for Kings (1989) 6: Put a chameleon on a camo shirt and the fucker’d go crazy.
1995		C. Hiaasen Stormy Weather 225: She tugged on the sleeve of his camo shirt.
2000		N. Griffiths Grits 68: A teyk-a andful-a downers out-ame cammy jacket.
2001		‘Randy Everhard’ Tattoo of a Naked Lady 118: A scrawny dude in a greasy denim jacket and camo pants.
2008		T. Dorsey Atomic Lobster 24: A pot-bellied redneck in a mesh-back camo cap swayed drunkenly.
2010		Codella and Bennett Alphaville (2011) 28: They arrive in tricked out Jeeps, Beamers and Mertzs done up in gloss black, camo, or day Glo custom finish.
2012		M. McBride Frank Sinatra in a Blender [ebook] The waitress in cammo returned with a well-rehearsed smile.
2013		J. Ordoñez ‘The Last Job’ in ThugLit Aug. [ebook] [S]even or eight young men in camos with semi-automatic sidearms.
2019		S.M. Jones Lives Laid Away [ebook] Her large camo Army surplus backpack.
2021		T. Pluck Boy from County Hell 24: Camo pants and caps to keep the sun off their lined faces.