"Ladies properly keep their hats on indoors, everywhere except their own houses, during the day," she writes. "Luncheons even traditionally required ladies to wear hats."Miss Manners recognizes that some rules vary peculiarly. It is acceptable for Christian women to wear hats in church, but disrespectful for men to wear them. Not so with Conservative or Orthodox Jews, who would find it disrespectful for men not to cover their heads with a yarmulke when in a synagogue.
All right, all right! I stand corrected, everyone! Etiquette does not require that ladies remove their hats when indoors!