The supporting cast is impeccable. Isabelle Huppert plays the icy, chain-smoking manager, Claudine Colbert, who sees Mrs. Harris as a disruption to the natural order. Lambert Wilson plays the Marquis de Chassagne, a bankrupt aristocrat who becomes Ada’s unlikely ally. And Lucas Bravo (the heartthrob from Emily in Paris ) trades his chef’s whites for a tailor’s thimble as André, a handsome accountant who believes couture is art, not commerce.

In the sprawling landscape of modern cinema, where superheroes level cities and thrillers trade in moral grayness, it takes something radical to stand out. Something quiet. Something... polite.

Told the dress costs £500—an astronomical sum in post-war Britain—Ada doesn’t sigh and turn away. She starts saving. She skips meals. She takes on extra work. When she finally scrapes together the funds, she does the unthinkable: she buys a one-way ticket to Paris, walks into the House of Christian Dior, and asks them to make her a dress.