PEOPLE reports that a one-of-a-kind rainbow coat, designed by Broadway costume designer William Ivey Long and originally worn by Joan Rivers at a Las Vegas Pride event, has been donated to the Family Equality Council to be included in their upcoming auction.
"My mother loved, respected and celebrated families of all kinds," Melissa, 48, said in a press release for the auction, which will take place May 9 at the Night at the Pier gala at Pier 60 in New York City.
"She would be thrilled to know that her coat, which celebrates diversity, is being sold to benefit loving families," added Melissa.
"Joan Rivers was a celebrity pioneer in her unbridled support of the LGBT community," said Ian Patrick, Deputy Director of Events at Family Equality Council. "We are honored to offer this precious piece of her legacy to support our work to secure a rightful place for LGBTQ-headed families in America."
The coat, which Joan originally wore at the Las Vegas Pride Parade in 2012, is a glittery gold gown adorned with a ruffled-neckline, and opens up to reveal a sparkly rainbow lining.
It was designed by Broadway costume designer William Ivey Long at Joan's request and will be available for bidding at the auction itself as well as online ahead of time.