What would be a good Latin word for "women", "ladies", "female(s)", or the like when I want to indicate the gender designation of a sauna or a toilet? In English I would choose "ladies", or perhaps in a very informal setting "women". I specifically want to avoid any offending or pejorative tones in the word, and I am not sure which Latin word would be the best choice. Femina, mulier, and domina come to mind, but I am unsure about how their tones compare.
I don't think that there's any doubt. Domina has a suggestion of class, the primary meaning of femina is 'female' (of whatever species), puella is age-restricted but mulier is a general word that can apply to all, with the advantage of the related adjective muliebris that Penelope has pointed out.