You ought to get out of those wet clothes and into a dry martini.

Mae West (1892-1980) American film actress

Every Day’s a Holiday (movie) [Larmadou Graves] (1937)

West both starred in the film (as the recipient of this line, Peaches O'Day) and wrote the screenplay. Often attributed to Robert Benchley, who used the line in a film a few years later, and claimed he got it from a joke book. Also attributed to Groucho Marx.