The skirt train is said to have been discontinued for day wear in 1880, only being retained for evening and bridal wear after that date.Even allowing for an older lady’s possible conservative taste, a date estimate of c.1876-80 seems correct for this photograph.
Generally this type of pose and setting is characteristic of the 1860s, but in this instance the composition presents a red-herring.
Clients could to a degree choose their pose when being photographed and sometimes – presumably if they were particularly pleased with their appearance – they might favour the traditional full-length composition, to set their attire off to best advantage.
We can see how much more pleasing the full-length effect would have been, compared to the more fashionable 1870s/1880s three-quarter length pose that cut off the lower legs and feet.
and it spread throughout Europe and then quickly to America and the rest of the world.
Each photograph was the size of a visiting card, and such photograph cards were traded among friends and visitors.