Hogan's Heroes..1965-1971..so funny at the time. P.O.W camp, Stalag 13, a group of prisoners running undercover ops to sabotage the enemy, running rings around Colonel Klink, and a rather thick guard called Schults! Very much a Carry On format
The Addams Family (movie version, though the TV series came first). Other films that would make good Hallowe'en costumes because they're famous, though not really "fashion": The Munsters (similarly, a TV show first), scI-fi (Barbarella, Star Trek, Star Wars, The Rocky Horror Picture Show), fantasy (Mary Poppins, any Disney animation), Rocky, Shaft, Tom Cruise in "Risky Business", Men in Black.