... opened on Broadway in May 1954, and in London's West End in October 1955. The film version (starring Doris Day and John Raitt) was released in August 1957.
Both the musical and the film were of American origin, and as far as I can tell the title has never used the British spelling ('Pyjama').
The most famous song from The Pajama Game is Hernando's Hideaway.
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