Yes, you're right, SANTO SPIRITO is the 1969 comedy about female pirates. It deals with two sailors who flee their gambling debts and meet a woman who just has murdered her second husband. They flee in a sailing ship and are captured by these female pirates. The leader is Black Tiger, others have names like Dirty Gertie, Sugar-Tit, Snag-Tooth Miriam, Juicy Jane, Pick-Your-Nose Wilma, Poxie Doxy and Daisy La Rouge. One female pirate is a disguised British Captain who frees the three captured. He enlistens the two sailors in the British army and takes the woman as well as the pirate's treasure for himself. The film ends with a shot of the Waterloo battlefield where the two sailors were killed.
It's a funny screenplay, and so are even some notes in the screenplay like "a series of shots (what used to be called a 'montage')" or the description of characters like "The chieftain's trusted adjutant wears formidable falsies, foot-long eyelashes and brighty sequined eye-lids. (A strapping male actor plays this part under the inspiration of Danny La Rue and Mae West.)". The only actor's names which are mentioned are Edward G. Robinson or George Raft to play Beau Skouras, a gangster in a casino. But it's eays to imagine Jane Fonda, Pearl Bailey and Oja Kodar in it.