Zombikini (1970)

In order to put up the best hen-do of the generation, intern Karyn decides to steal some prototype hi-tech bikinis from her father's company for a test run with her friends. But daddy's famous for cutting corners when it comes to bikini safety, and the ex is actively covering up development mistakes. So faulty swimwear, a party island, sun, sea, cocktails - what could POSSIBLY go wrong?