The last image is probably the central portion of this image.
From Wikimedia; size doubled. Also posted to the Reign of Louis XVI 1775-1789 Album here.
Louise Hippolyte is wearing a tabbed under-bodice or an apron and, possibly, a ribbon surrounded by ruching to edge her over-bodice.
Keywords: Vestier, Louise Félicité Victoire d'Aumont, duchesse de Mazarin, Louise d'Aumont, duchesse d'Aumont, duchesse Mazarin et de La Meilleraye, princesse de Monaco, d’Aumont family, Grimaldi family, Duchess, Princess, French, high straight big curl coiffure, ribbon headdress, chemise, lace modesty piece, lace elbow length bottom flared cuffs, zone bodice, ruching, elbow length close sleeves, ruffled forward-back flared engageantes, bows, natural waistline, tabbed under-skirt, full skirt, ruched edge