Mack Sennett was a film producer during the silent era, and the ‘Sennett Bathing Beauties’ were women in bathing costumes performing comedy, an iconic act in the 1910s to 1920s.
Interestingly, Gloria Swanson, the actress playing Norma Desmond, was one of these bathing beauties in real life! (well, about 30-40 years before she starred in Sunset Boulevard)
Evidence of her delusion, denial, obsession with youth.