The newly engaged Diana Spencer wore this sweater while watching her future husband,Prince Charles play polo in 1981.
Although the product is not from a top designer brand, it gained considerable fame due to speculation.
The black sheep on the sweater was claimed to represent how the princess was perceived within the Royal Family.
The knitwear manufacturer, Warm & Wonderful, recently found the sweater in their storage.
The sweater and accompanying letters from Diana will be auctioned this year.
The estimated selling price for the sweater is between $60,000 to $80,000.
