From Wikimedia; spots and cracked paint flaws removed with Photoshop. Also posted to Empress Maria Theresia’s Subalbum here.
This is placed based on apparent age and may be anachronistic. The under-sleeves appear to be part of her chemise, and the over-sleeves have cuffs.
Keywords: van Meytens, Empress Maria Theresia, Maria Theresia von Österreich, Maria Theresia Walburga Amalia Christina, Erzherzogin von Österreich, Römisch-deutsche Kaiserin, Mária Terézia magyar királynő, Königin von Ungarn, Königin von Kroatien und Slawonien, Königin von Böhmen, Herzogin von Parma, Herzogin von Mailand, Herzogin von Luxemburg, Archduchess, Empress, Habsburg family, Austrian, straight coiffure, hair jewelry, earrings, lace neck band, lace-edged chemise, modesty piece, off shoulder scoop neckline, elbow length under-sleeves, lace cuffs, fitted bodice, jeweled bodice ornament, elbow length close over-sleeves, cuffs, vee waistline, full skirt