Berry at the Met Gala. Photo: Cindy Ord/MG25/Getty Images At the Met Gala on May 5, Halle Berry wore a dress that showed off slivers of skin and featured a dramatic train — so it isn’t a shock that her planned Cannes wardrobe was among the first to be affected by the film festival’s new dress code. “I had an amazing dress by Gupta that I can’t wear tonight, because it’s too big of a train,” Berry, who is on the festival’s jury this year, said at a Cannes press conference on May 13. “Of course I’