This article contains spoilers for Outrageous. If you didn’t know BritBox’s new limited series Outrageous was based on the true story of the Mitford sisters—women who were the Kardashians of their day, if the Kardashians were famous for aristocratic eccentricity, literary talent, and political views running the gamut from devoted communism to ardent Nazism (but equally given to squabbling amongst themselves)—you might think it was a version of Jane Austen’s Pride and Prejudice, transported to the 1930s. There’s a family who are part of the genteel landed gentry, with excellent connections but struggling to afford to remain in their social...