From Wikimedia; hazing around person suppressed and spots throughout image removed with Photoshop by gogm.
Constance wears a saya with a black over-dress and a spectacular brocade under-dress in an "open robe" format this portrait from the 1620s.
Keywords: Queen Constance of Poland, Habsburg family, Vasa family, Archduchess, Queen, Polish, straight coiffure, framing headdress, hair jewelry, high enclosing neckline, ruff, lace, false sleeves, tight false sleeves, back-flared cuffs, tabbed bodice, vee waistline, farthingale, necklace, earrings, pendant, handkerchief, saya