This portrait, called the "Madagascar portrait," shows the state of geographic knowledge as well as full dress.
From Wikimedia. Photo - Yelkrokoyade.
The Howards are dressed for court or Parliament in this van Dyck double portrait probably painted not long before he died in 1646.
Keywords: van Dyck, Yelkrokoyade, Alathea Howard, Alethea Howard, Alathea Talbot, Alethea Talbot, Countess of Arundel, Countess, British, curly coiffure, tiara, robes, trapezoidal décolletage, three quarter length puffed sleeves, order chain, necklace, earrings, jeweled bodice ornament