Ein Mann muß nicht immer schön sein (1956)

Peter Moll has to serve one day in jail for plagiarism. There he learns about a jewel hidden inside a black brassiere from a cell mate. The next day he sets out to find the undergarment with his friend and band mate Paul, only to discover that five of the same model have been sold. The search is on to find the diamond hidden inside the BH which is now being used to support the breasts of five possible suspects.