Throughout her life, the fiercely private film star preferred not to sign autographs, to sit for interviews or to even attend the Academy Awards.
A collection of modern photographs is expected to bring in $700k for the charity on April 6.
As a young bride, Bloomingdale fell for Haines’ style at a dinner party at the home of Ann and Jack Warner.
The sale of fashions, art and furniture is scheduled for Nov. 23 at Christie’s in London’s South Kensington.
Among the lots are wearable works by Man Ray and Alexander Calder.
The Iron Lady’s personal belongings sold for a total of 3.2 million pounds, or $4.8 million.