Jokingly, Corrin adds: “I remember the first one, I was like, ‘Should my mum be here?’ I was like, ‘This is such a… it is a wedding dress fitting. It might be the only one I do in my life.’”
The featurette also depicts how Roberts created Margaret Thatcher's "extraordinary, hugely feminine" style as she "was obsessed with clothes", as well as the difficulties that went into Roberts and director Jessica Hobbs' journey for Princess Margaret, played by Helena Bonham Carter, in episode seven.
“We just talked about this late-life bruising, what was happening to her,” Hobbs says. “It's just so beautiful when you go through the episode and realise what Amy's done… Suddenly all these colours appear, which are very like a bruise deepening over time.”
Speaking on her personal experience from her countless years in the industry, Bonham Carter said: “I’ve never spent more time on a job in costume. It was very much a collaboration. Although, Amy, a lot of the time, would say, ‘Just shut up and get on with it, you look marvellous.’”
Fascinated? You can check out Netflix's full featurette Costumes of The Crown here.