How long?! Margot Robbie's Met Gala gown took hundreds of hours to create Margot Robbie's Met Gala gown took a staggering amount of time to put together, and over 1,000 pieces of embroidery. 5 May 2026 Margot Robbie's Met Gala gown took 761 hours to make. Margot Robbie's Met Gala gown was a mammoth effort The 35-year-old actress stepped out in a stunning strapless gold dress from Chanel for Monday's (04.05.26) annual fundraiser for the Metropolitan Museum of Art's Costume Institute in New York.