Joseph Fields & Anita Loos' "Gentlemen Prefer Blondes"

Based on the book of the same name, Gentlemen Prefer Blondes follows the life of Lorelei as she takes a voyage on the Ile de France to Paris to perform in a nightclub.  Already engaged to be married to a much older man, Lorelei flirts with many men aboard the ship including a rich Philadelphia man and an Englishman.  Lorelei's fiance's father, who has never approved of Lorelei, hires a private detective to track her whereabouts in Paris.

Lorelei sings hits "I'm Just a Little Girl from Little Rock" as she is wined and dined by the Philadelphian and the Englishman.  She even turns the eye of a zipper king who is pedalling the first dress with a zipper.

However, when Lorelei's fiance arrives in Paris and declares his undying love for her, to the tune of  "Diamonds are a Girl's Best Friend", she decides he is the man for her after all.  Her fiance's father finally accept Lorelei when he discovers she is wearing a dress with buttons, his own invention.

Gentlemen Prefer Blondes debuted on Broadway in 1949 and ran for 740 performances.  It was the debut performance of Carol Channing, who became synonomous with the song "Diamonds are a Girl's Best Friend".  Gentlemen Prefer Blondes premiered on the big screen 1953, starring Marilyn Monroe and Jane Russell.

https://www.youtube.com/watch?v=UcyDo0fthZI