Maria Kazimiera was not the only member of the de La Grange d'Arquien family to settle in Poland. This de La Grange sister, Maria Anna, married Count Jan Wielopolski. A genealogical sketch for Maria Anna is here.
From the museum's Web site; filled in shadows and increased exposure.
Maria Anna's bodice looks like a piece of armor with a bertha above it, a sleeve sprouting from the side, and a skirt emerging below.
Keywords: 1678, Callot, Maria Anna de La Grange d'Arquien, Maia Anna Wielopolska, de La Grange d'Arquien family, Wielopolski family, Countess, Polish, curly coiffure, bodice, scoop neckline, bertha, quarter length puffed over-sleeves, elbow length flared under-sleeves, vee waistline, full skirt, necklace, earrings