They entertained by stripping off their clothes on stage, it started in Vaudeville where they went from fully dressed to a tiny costume, Burlesque became a genre of its own where the show was just ladies stripping on stage. As things got more adventurous Strippers would offer their act even on Night Club floors. Later in the Century as technology evolved Ladies would perform on film and then video tape.
Betty Howard with a flourish at the end
Patti Waggin doing her hair while kneeling just wearing black lingerie
Topless Server at “The Phone Booth” 1966 LA