Have you noticed?

“One of the best things about watching period dramas is arguably the costumes. They play a huge part in conveying the full effects of the period, even if they’re not 100% historically accurate. Bonnets, top hats, spencer jackets, petticoats, and tight breeches: What more could you need in a costume drama?” 

Source: 14 costumes that have been reused again and again in British Period dramas