Princess Diana's famous 'black sheep' sweater up for auction after being found in attic 40 years later

The former Princess of Wales' sweater, which she wore before her marriage to Prince Charles in 1981, is expected to fetch up to $80K

Princess Diana’s famous "black sheep" sweater is one of several items currently up for auction at Sotheby’s in New York for their inaugural Fashion Icons sale. 

Diana wore the red sweater with a pattern of white sheep and one black sheep to a polo match in 1981 while she was engaged to then-Prince Charles. 

"The sweater’s been tucked away in an attic for more than 40 years," Frank Everett, Sotheby’s senior VP and sales director for jewelry, told "Today" on Wednesday. "We love a discovery story in the auction world." 

The sweater was rediscovered earlier this year in the attic of English knitwear shop Warm & Wonderful after the sweater, which had been torn by Diana on the sleeve, was put away in a box decades ago and a replacement was knitted for the royal. 

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Princess Diana wearing her black sheep sweater

Princess Diana wore the black sheep sweater at a polo match in 1981. ( Tim Graham Photo Library via Getty Images / Getty Images)

"Apparently when the letter came from the palace requesting a new one, they said either a repair or a replacement," Everett said. "They decided to knit her a new one and there are some design differences in the second one she wore and someone just threw it [the first sweater] in a box and it went in the attic. Forty years later, now here it is at Sotheby’s." 

Diana wore the replacement sweater in 1983. 

Everett told "Today" that the estimate for the sweater at the auction, which opened on Thursday, was $50,000 to $80,000 and it was already at $70,000 by Wednesday.

He said it would not sell until bidding closes on Sept. 14. 

Headlines of Diana in the sweater catapulted demand for it, which Warm & Wonderful still sells in cotton for $250. 

Actress Emma Corrin, who played a young Diana in "The Crown," also wore a replica of the sweater in season 4 of the Netflix series.

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Princess Diana with Prince Charles in her black sheep sweater

Diana wore her replacement sweater in 1983. (Princess Diana Archive/Getty Images / Getty Images)

The buyer also gets the original letter from Diana’s personal secretary requesting the repair and a thank-you note after she received the replacement. 

Another of Diana’s outfits, a Murray Arbeid evening dress she wore to Prince Edward’s 21st birthday in 1985 and to another event in December of that year, is also up for auction. 

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Princess Diana wearing Murray Arbeid

Princess Diana was considered a fashion icon during her all-too-short life. (Terry Fincher/Princess Diana Archive/Getty Images / Getty Images)

Also included in the Fashion Icons auction is the vintage taxidermied bird of paradise headpiece worn by Sarah Jessica Parker in the "Sex and the City" movie, a 1950s Normal Norell black lace dress worn by Michelle Obama, a circa 1910s lace wedding veil worn by Madonna in Vogue this year, Kate Winslet’s custom-made Alexander McQueen gown worn to the 1998 Oscars and a collection of Lauren Bacall’s Hermès bags. 

Sarah Jessica Parker wearing a bird of paradise headpiece

Sarah Jessica Parker wore a vintage taxidermied bird headpiece in the "Sex and the City" movie. (James Devaney/WireImage / Getty Images)

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Kate Winslet at the 1998 Oscars

The Alexander McQueen dress Kate Winslet wore to the 1998 Oscars is also up for auction. (Jim Smeal/Ron Galella Collection via Getty Images / Getty Images)

"These striking garments and accessories belonging to and worn by some of the most celebrated individuals across the worlds of fashion, film, music and politics each possess a unique narrative in the wide-spanning history of fashion," Cynthia Houlton, Sotheby’s global head of fashion and accessories, told People magazine of the collection. "Sotheby’s is immensely privileged to showcase these treasures to the world, catering to the passions and enthusiasm of fashion aficionados and collectors alike."

The Associated Press and Fox News' Stephanie Nolasco contributed to this report.