William Travilla, who designed some of Marilyn Monroe's most iconic costumes he worked on eight of her films is the designer behind the polka dot dress worn in The Seven Year Itch that Marilyn Monroe's 'The Seven Year Itch' White Dress Everything to Know About Her Iconic Costume and Where It Is Today The same designer who created Marilyn's $4.6M white halter dress also made Lauren Bacall's wedding gown in How to Marry a Millionaireyet it sold for just $8,000 at auction. Shockingly low for Marilyn Monroe wearing platinum and white gown designed by William Travilla for the premiere of How To Marry A Millionaire in LA on November 4, 1953 : r whatthefrockk