From the Roy Precious Web site; image size doubled.
This may be an advertising portrait using the artistic convention of showing a Lady en déshabillé. Her dress has split bodice and sleeves.
Keywords: 1670, Wissing, Popham family, British, curly coiffure, chemise, off shoulder scoop neckline, modesty piece, full under-sleeves, split bodice, quarter length split over-sleeves, clasps, jeweled arm bands, wrap