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It seems Kate Middleton is not the only royal girlfriend whose sheer apparel is considered a valuable artifact.

Later this month, elegant négligées, luggage, Christian Dior handbags and other items once owned by American socialite Wallis Simpson -- the woman whose scandalous affair with Great Britain's King Edward VIII culminated in his 1936 abdication -- will hit the auction block for charity in London, the BBC reports.

The items, which include Louis Vuitton luggage and a "sublime bias cut négligée" are said to give a hint of Simpson's mystifying allure and her storied romance with the former king, which changed the course of monarchal history.

London's Kerry Taylor Auctioneers expects the the pieces to fetch big prices, in much the same way that a lot of the couple's extensive jewelry collection produced record prices last year, selling for $12.5 million.

The latest items up for bid come from the contents of the couple's former Parisian home, which were previously purchased by Egyptian magnate Mohamed al-Fayed.

Fayed, the father of Dodi al-Fayed, who perished with Britain's Princess Diana in a 1997 Paris car crash, plans to donate proceeds from the auction to the Dodi International Foundation, which assists children in need of medical care in the United Kingdom and Egypt.

Some of the soon-to-be auctioned items were gifts the twice-divorced Simpson received from the former king during their affair, which was pivotal in the history of Britain's modern monarchy and the plot line of 2011 Academy Awards Best Picture winner, "The King's Speech."

Actress Eve Best portrayed Simpson in the biopic about her third husband's replacement as monarch, the brave and stuttering King George VI.

Simpson once wrote: "I'm not a beautiful woman. I'm nothing to look at. So the only thing I can do is dress better than everyone else."

So, it seems that some of her evening wardrobe, which includes several sheer nightgowns with coordinating capes was part of her sartorial game plan: "The sublime bias-cut confections that were her nightwear give an intimation of the sensuousness and secret allure of the duchess," a representative of the auction house told the BBC.

The couple's romance has captivated for generations, with pop icon Madonna directing a movie "W.E.," which she co-wrote, about their lives.

Meanwhile, read how much the sheer dress Britain's future queen was wearing when she met Prince William while a college student is expected to fetch at auction this month.

And speaking of Madonna, check out what she wasn't wearing at the Vanity Fair Oscars' party.