In a search limited to "Clothing of Sephardic Jewish women of the 19th c." I was returned thousands of thumbnail photos of Sephardi women and men in many centuries including one of Ivanka and Jared Kushner (21st c.).* The headdress is closest to being pictured in a photo-portrait of two girl's headdresses (on the girls) for what seems to be a "festive dress" occasion. These are structured very similarly to that in "The Mother of Etta Nathan."
Included in this lineup are placards of criteria for dressing, which seem to include more than Sephardic, as do the photos. Occasionally a designation of place is included. Worthy looking for those with Jewish Roots or anyone interested in social history and conformity and non-conformity.
The Mother of Etta Nathan has dressed according to the criteria for observant or even orthodox women. Completely form-covering (as in not describing the woman's figure, her multilayered "suit" or "ethnic costume" covers her to the neck and wrists, and presumably to the floor. Her hair is completely covered. Etta's mother seems to wish not to be having her photo taken, and so she does not project a happy woman. Nor does she seem neutral. Perhaps her shtetl (village) wants women to be absent, invisible, or not to be photographed (pure conjecture). At the very least, she seems withdrawn, and at the most, afraid.
The search didn't include Ashkenazi clothing--but that can still be done by someone. It's very interesting to see photos taken mainly in celebration over something like 150??? estimated years of life.
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* the site offers ways to enlarge and, if you are clever, to copy and paste here: It comes up on Safari without a url, as the first entry.