Marion Cotillard may be a powerhouse onscreen, but offscreen the Oscar-winning actress describes herself as “a very sensitive person” who is less than comfortable with the “frantic, intense and chaotic” energy that comes when stepping out on the Cannes Film Festival red carpet. “I’ve done it maybe 20 times, but it’s always the same anxiety that gets me,” the French superstar tells The Hollywood Reporter over Zoom. But as one of the most frequent movie stars to make it to the festival selection, the actress has developed a chic coping strategy. “I need to be comfortable with my clothes and with my look, so that I can be myself to walk through the intensity,” explains Cotillard, who has armfuls of luxury threads at her disposal as a longtime ambassador for Chanel . “How I dress for Cannes depends on how I want to feel,” she says, adding that her history reflects many periods in her life.…