"Columbo's raincoat was designed and manufactured in Spain, by a company called Cortefiel. (Translated into English, "cortefiel" means "good tailoring".) Peter Falk wore the same raincoat throughout the 'NBC' run of 'Columbo', but there were two or three "stand-in" coats." (I want a 'stand-in' coat so much!)
Photograph Link - The Columbo Site.
Harold Wilson made the Gannex raincoat famous in 1956, when he wore it on a world tour. Celebrities soon followed suit. (Or coat) "Just one more question...?" Which one would you have.....
Gannex - Wiki info
Harold Wilson's raincoat displayed in Scilly Isles museum 2014