The iconic dress Audrey Hepburn wore in Sabrina (1954) is to star at Profiles in History in LA.
The piece is consigned from the collection of the late actress Debbie Reynolds, who was one of the first people to begin seriously collecting movie memorabilia.
The dress was designed by French fashion house Givenchy
In 2011, the first major sale of Reynolds' collection took place – resulting in the record $5.6m result for Marilyn Monroe’s white Subway Dress from The Seven Year Itch.
This latest auction features the remainder of her collection alongside pieces consigned from her daughter Carrie Fisher, who also died last year.
This dress is expected to make around $80,000-120,000 when it crosses the block on October 8.
Joe Maddalena, owner of Profiles in History, explained to the Hollywood Reporter that he and his team found it in a trunk in a storage space.
“There's just no way that Debbie knew she had this," Maddalena said.
“She purchased so many things over the years, at one point it was just likely forgotten.
"It really is one of the four or five most famous dresses in cinema history, and we almost missed it. If we hadn't opened those trunks, they likely would have just gone to [thrift store company] Goodwill.
"It's the best thing in the auction, hands-down. It would be the best thing in anybody's auction. There are very few moments in which the stars truly align, but this costume is one of them."
The auction will also feature Carrie Fisher’s scripts to the Star Wars movies.
Please sign up to our free newsletter to receive exciting news about royal memorabilia auctions.