Notice all the people other than the three central figures are not looking at the couple, but at the viewer.
From oldrags.tumblr.com/tagged/17th+century/page/5.
This may be a more accurate depiction of Marie's wedding than the Rubens portrait. Marie's dress is in the Spanish saya style.
Keywords: 1600, Chimenti, Marie de Medici, reine de France, Queen of France, Medici family, Bourbon family, Queen, straight coiffure, hair jewelry, ruff, lace, tabbed sleeves, hanging sleeves, false sleeves, back-flared cuffs, tabbed bodice, vee waistline, full skirt, earrings, draped necklace, saya