Quite a few of the costumes in the 1999 version of ‘Mansfield Park’ have been reused from or in other productions. Here is a list I’ve collected from RecycledMovieCostumes.com:
A pink dress worn by an extra at Fanny’s ball was also worn by Mrs. Forster (Victoria Hamilton) in ‘Pride and Prejudice’ (1995), an extra at the Westons’ ball in ‘Emma’ (1996), an extra in ‘St. Ives’ (1998), an extra in ‘Quills’ (2000), an extra in ‘Byron’ (2003), and an extra at a ball in London in ‘Sense and Sensibility’ (2008).
The long, green coat that Susan Price wears was also worn by Charlotte Lucas (Lucy Scott) in ‘Pride and Prejudice’ (1995), by Clara Copperfield (Emelia Fox) to her husband’s funereal in ‘David Copperfield’ (1999), by Annabella, Lady Byron (Julie Cox) in ‘Byron’ (2003), and by Kitty Bennet (Florence Hoath) at Jane’s wedding in ‘Lost in Austen’ (2008).
Mary Crawford wears a wine colored, gold embroidered dress while rehearsing ‘Lovers’ Vows’. This costume was also worn by Lady Frances Nelson (Anna Massey) in ‘I Remember Nelson’ (1982), Martha Brett (Belinda Lang) in ‘The Bretts (1987), an extra in ‘Duel of Hearts’ (1991), Lady Apthorpe (Jacqueline Pearce) in ‘Princess Caraboo’ (1994), an extra at the ball in London in ‘Sense and Sensibility’ (1995), in ‘Napoleon’ (2002), Lady Holland (Jane How) in ‘Byron’ (2003), and Sue Perkins in ‘The Supersizers Go: French Revolution’ (2009).
The cream, embroidered dress Maria Bertram wears was reused as a dressing gown on Fanny Dorrit (Emma Pierson) in ‘Little Dorrit’ (2008). It is also worn by Maria Oldknow (Carice van Houten) in ‘From Time to Time’ (2009) and Jane Hayes (Keri Russell) in ‘Austenland’ (2013).
The green dress with red trim worn by a woman in London with Henry Crawford was previously worn by Fanny Dashwood (Harriet Walter) in ‘Sense and Sensibility’ (1995).
Mrs. Norris’s yellow dress is also worn by Mrs. Meagles (Janine Duvitski) at Arthur Clennam’s wedding in ‘Little Dorrit’ (2008) and an extra at the Westons’ ball in ‘Emma’ (2009).
Susan’s striped, drop-front day dress was also worn by a maid in ‘Byron’ (2003), an extra in ‘Eroica’ (2003), Marianne Dashwood (Charity Wakefield) in London in ‘Sense and Sensibility’ (2008), and Hanna (Mary Roscoe) in ‘Great Expectations’ (2011). A dress from the same fabric but with different sleeves and lacking the drop-front is worn by Mrs. Morland (Helen Fraser) in ‘Northanger Abbey’ (1986), Harriet Wantage (Suzanna Hamilton) in ‘Duel of Hearts’ (1991), Ella (Kate Ashfield) in ‘Princess Caraboo’ (1994), and by Harriet Smith (Toni Collette) to receive Mr. Elton’s charade in ‘Emma’ (1996).
The red print gown worn by Mrs. Norris has the distinction of being used in two versions of Mansfield Park, being also worn by Mary Crawford (Hayley Atwell) at Maria’s wedding in ‘Mansfield Park’ (2007). It is also worn by Lady Russell (Susan Fleetwood) at the party at Camden Place in ‘Persuasion’ (1995), Catherine Bigg (played by ?) in ‘The Real Jane Austen’ (2002), a guest at a London ball in ‘Byron’ (2003), Elizabeth Devonport to dinner in ‘The Regency House Party’ (2004), Anne Steele (Daisy Haggard) to dinner in London in ‘Sense & Sensibility’ (2008), and Mrs. Bennet (Alex Kingston) in ‘Lost in Austen’ (2008).
The pale blue spencer Julia Bertram wears at the end was previously worn by Georgiana Darcy (Emilia Fox) in ‘Pride and Prejudice’ (1995).
Lady Bertram’s green dress with the sheer overlay was previously worn by Elizabeth Bennet (Jennifer Ehle) in ‘Pride and Prejudice’ (1995) and subsequently worn by an extra in ‘Doctor Who: A Good Man Goes to War’ (2011).
The pink spencer Julia wears in London with the Rushworths was also worn by Kitty Bennet (Polly Maberly) in ‘Pride and Prejudice’ (1995), an extra in ‘Emma’ (1996), Henrietta Musgrove (Rosamund Stephen) in ‘Persuasion’ (2007), a Miss Martin at Harriet Smith’s wedding in ‘Emma’ (2009).
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Disclaimer: I have not seen, nor do I recommend, all of the movies mentioned in this post.