The 'Rose' singer will put many of her most iconic costumes on the block at Julien's Auctions next month to raise money for her New York Restoration Project charity.
One item up for auction is the mermaid costume that Midler wore in several stage shows, including her recent Las Vegas residency.
The mermaid suit was the subject of controversy earlier this year, when GaGa wore a similar suit during a secret Sydney gig in July.
Midler tweeted that GaGa had copied her signature style, while the 'Bad Romance' singer insisted she had no idea Midler ever wore a similar stage outfit.
"I'm a huge Bette Midler fan… Maybe we're just cut from the same cloth," Gaga said at the time.
Midler has explained that she has no hard feelings over the squabble, adding that she hopes GaGa actually buys the costume when the auction gets underway on November 13.
"Some of my best ones are up for auction, and some of my chorus girls are up for auction, and I am waiting for GaGa to get in there and grab hers. Some of the wheelchairs are up for auction. I mean, there is a selection from everything," Midler told The AP.
"I would be thrilled [if GaGa bought the outfit]. I hope she buys at least a little bit. It would be fun. There are so many wonderful ideas and so much of it. So much of it is so funny."
Several gowns designed by Bob Mackie and Midler's 1992 Oscar dress will also be up for sale.
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Watch Bette Midler perform in her mermaid suit below: