Queen Margrethe II of Denmark was the Costume Designer for the film.
In a 2023 interview with Variety, Bille August spoke about collaborating with the Queen of Denmark, H.M. Queen Margrethe of Denmark, on the film's design: "The Queen and I started discussing the production design and costume for the film 10 years ago. When I saw her decoupages I immediately began to understand the cinematic space of the script. So I started meeting with the Queen regularly to discuss the script and characters; we would go over each scene she made the decoupages for. It was a fruitful collaboration and an exciting process because we had different approach and ideas - something fresh came out of it... surely the atmosphere of the film is somewhat burlesque and it has to do with the decoupages made by the Queen. She's got a great sense of humor and wanted to keep it witty, cross the boundaries. I admired her creativity and level of commitment because a Queen has a very strict schedule and loads of official duties, but this is Margrethe II's big passion and she dedicated a lot of her free time to work on this film. That's really special. Not many royals are such creative forces."