It would be good to know the nationality of the noblewoman as well as the painter and the location.
From history-of-fashion.tumblr.com/post/128852296999/1660-1675-unknown-artist-portrait-of-a via pinterest.com/Hattie995/%7E-1660-1680-female-clothing-%7E/; upper edge fixed with Photoshop.
This dress has a busk-like over-bodice over an under-bodice that resembles a late 1870s cuirasse bodice. The non-embroidered portion of the skirt is gathered under the cuirasse under-bodice.
Keywords: hurluberlu coiffure, ribbon headdress, necklace, lace bertha, straight neckline, over-bodice, three quarter length full virago sleeves, lace cuffs, ribbon cuffs, cuirasse under-bodice, full skirt, brooch, feather folding fan