I am guessing these are university women in costume for some theatrical production with a water theme or scene. I have no idea who they are supposed to be. There is one too many for the Rhine maidens.
Here's Baby Snooks as we are not accustomed to seeing her. I'm guessing this is early 1920s during her Ziegfeld Follies days prior to her My Man and Second Hand Rose musical hits. An 8x10 print of this photo recently sold at auction for $550 USD.
An ethereal, dreamy portrait of the Moore sisters -- Decima, Eva, Bertha, and Jessie -- all of them musical performers on the British stage in the early 1900s. This is a commercial real photo postcard from 1905.