Wikimedia sources this to Artnet so the portrait has been or will be auctioned.
Fixed the left tenth of the bottom edge with Photoshop.
Zita wears a black ribboned order bow beneath an ominous sky in this portrait. This may be a fitted, not blouson or pouter pigeon, bodice.
Keywords: 1917, Mayerhöfe, Empress Zita, Zita di Borbone-Parma, Zita Maria delle Grazie Adelgonda Micaela Raffaela Gabriella Giuseppina Antonia Luisa Agnese, Zita von Bourbon-Parma, Zita magyar és cseh királyné, Zita of Bourbon-Parma, osztrák császárné, Kaiserin von Österreich, Apostolische Königin von Ungarn, Kaiserin Zita, Zita of Bourbon-Parma, Princess, Empress, Borbone family, Habsburg family, wavy coiffure, necklace, bodice, lace bertha, floral bodice ornament, order bows, close sleeves, fur-trimmed coat