Princess Diana (Photo : Getty Images/Joel Saget/AFP)
Picture shows three pieces of clothing worn by Princess Diana during an exhibition at Sotheby's auction house in Paris on May 17, 2010.

One of Princess Diana's most iconic blouses is going up for auction next month. 

The late royal's ruff-collared, pink crepe blouse is expected to bring in between $80,000 and $100,000 at Julien's Auctions and Turner Classic Movies' upcoming Hollywood Legends auction.

The blouse was worn by the late Princess of Wales in her 1981 engagement portrait with then-Prince Charles. The portrait captured by Lord Snowden was heralded as "one of the most iconic images ever taken of Princess Diana," according to a Julien's Auctions press release.

Crafted by the talented duo David and Elizabeth Emanuel, who also later designed Princess Diana's iconic wedding gown, the blouse features a satin pastel pink ribbon beneath the ruffled collar, peasant-style sleeves with ruffled cuffs, and elegant loose pleats.

Princess Diana BRITAIN-ROYALS-FASHION (Photo : Getty Images/Daniel Leal/AFP)
A chiffon blouse by the designer Emanuel, and worn by Princess Diana, at her first official portrait by Lord Snowdon, consequently published in Vogue in February 1981, is pictured during a press preview of the forthcoming exhibition entitled "Diana: Her Fashion Story", at Kensington Palace in London on February 22, 2017.

The piece's material was salvaged from a custom-made gown that a client accidentally left a mascara stain on when trying on the dress, according to Elizabeth's book "A Dress for Diana."

The blouse caught the attention of the former Princess of Wales as she selected it from a rack of clothes curated and presented to her by then-British Vogue fashion editor Anna Harvey, as per Julien's Auctions.

Harvey introduced the Emanuels to Diana when the latter asked who made the pink blouse.

"When she saw our blouse on the rack, she fell in love with it, asked who had made it and was directed to us," Elizabeth wrote in her book, according to CNN.

The designer eventually chose to sell the blouse in 2010 after keeping it for years. The garment was showcased at Kensington Palace as part of an exhibition from 2017 to 2019.

An evening gown worn twice by Diana in public will also be up for sale at the same auction. It is expected to fetch up to $200,000.

The gown is embellished with stars and boasts a dropped waist, padded shoulders, and a blue skirt, CNN reported.

Scheduled from Dec. 14 to 17, the auction will take place in Beverly Hills and on the auction website.

Princess Diana exhibition (Photo : Getty Images/Carl Court)
A member of staff poses with a 1981 Emanuel pale pink chiffon blouse with a satin neck-ribbon worn during Diana's first official portrait in 1981 during a preview for the forthcoming 'Diana: Her Fashion Story' exhibition at Kensington Palace on February 16, 2017 in London, United Kingdom.