(chiefly US, informal) A costume or outfit, especially one that is ostentatious or otherwise unusual.
1899, Joseph Conrad, ,When near the buildings I met a white man, in such an unexpected elegance of get–up that in the first moment I took him for a sort of vision.
1917, "1,200 Reading Firemen March," Reading Eagle (Pennsylvania, USA), 28 Oct. p. 4:The Schnitzelbank Band, each member attired in an odd getup, received many comments for the manner in which the men marched.
2002, Andrea Sachs, "Caricature Builder," Time, 21 Jan.:"A bully. Picked on fellows. He loved to fight. But I never saw him in a getup with a fellow his own size."
(publishing) Layout and production style, as of a magazine.