From Wikimedia; removed probable reflection artifact from left side of the under-bodice with Photoshop.
Lady Margaret's dress is more revealing than the one seen in this image, but otherwise similar including the wide English headdress.
Keywords: Holbein - Hans the Younger, Margaret Wotton, Wotton family, Grey family, Marquise, English, English headdress, veil, chemise, modesty piece, square neckline, fur-edged split under-bodice, fur-trimmed over-bodice, square neckline, fur-trimmed upper sleeves, puffed lower sleeves, back-flared cuffs