Zaida Ben-Yusuf took this photograph called Portrait of Miss S. in 1899.

I’m curious why the model isn’t identified. My guess is that she was a friend of the photographer rather than a client. She has a regal bearing. She looks like a Somebody. Nevertheless, I doubt she was a member of an upper-crust New York family. She looks too capable. She has sharp, observant eyes.
Another possible reason the model wouldn’t be identified is if the picture would be considered too edgy. Maybe by 1890s standards, her outfit would be considered outrageous. It’s more theatrical most American fashions in the spring of 1899:

I really like her cape, especially the high collar.