The yellow gown worn by Fiona Victory (Caroline Enys) at the London ball is the same costume worn to dinner by Tanya Samuel in The Regency House Party (2004), and by a guest at the Duchess of Richmond's ball in Vanity Fair (1998).
The lavender gown with sheer sleeves worn by a guest at the London ball is the same costume worn by Liz Crowther (Julia Bertram) at the Southerton ball in Mansfield Park (1983), by a guest at the Netherfield Ball in Pride and Prejudice (1995), and by an extra in the sketch "Pride & Racial Prejudice" in The Omid Djalili Show (2007).
The dark velvet Spencer with white frog closures worn by Sarah Carpenter (Lady Harriet) while reading George Warleggan's letter is the same costume worn by Natasha Little (Becky Sharp) while speaking to Mr. Wenham in the street in Vanity Fair (1998), and by Romola Garai (Emma Woodhouse) in church in Emma (2009).
The sheer brown gown with white embroidery worn by a guest at the London ball is the same costume worn by Faith Brook (Countess Rostova) in War & Peace (1972), by an extra at the London Ball in Episode #2.2 (1977), and by Kelly Hunter (Lady Steyne) at the Prince Regent's party in Vanity Fair (2004).