This is essentially a close-up from the portrait seen in the next image.
From Wikimedia; spots removed with Photoshop.
Katarina’s neckline resembles those of Velazquez portraits. It has a partlet set off by a thin band above a lace bertha. The lace bertha ends in epaulettes.
Keywords: Katarina Karlsdotter Vasa, Catherine of Sweden, Countess Palatine of Kleeburg, prinsessa av Sverige, Katharina Wasa, Katharina von Schweden, Titular-Herzogin von Zweibrücken, Pfalzgräfin von Zweibrücken-Kleeburg, Katarina Karlsdotter Vasa, Catherine of Sweden, Countess Palatine of Kleeburg, prinsessa av Sverige, Katharina Wasa, Katharina von Schweden, Titular-Herzogin von Zweibrücken, Pfalzgräfin von Zweibrücken-Kleeburg, Vasa family, Wittelsbach family, Princess, Countess, proto-hurluberlu coiffure, earrings, necklace, partlet, scoop neckline, basque bodice, lace bertha, bateau neckline, brooch, draped jeweled bodice ornament, lace-edged epaulettes