Her article in thepeerage is here. I read Sir John Cotton's article in thepeerage after estimating the date to be 1620. He died in 1620 so this is mourning dress. She had one child, John seen here in matching dress. She went on to marry Sir John Carleton in 1625 and had three children by him.
From bjws.blogspot.com/2013/01/1500s-fashion-gentlewomen-with-their; image made lighter by gogm.
Lady Anne's dress s obviously decorated with numerous rows of thin closely spaced slashes revealing a light-colored under-garment, perhaps a white chemise or the patterned material of her under-skirt.
Keywords: 1620, Gheeraerts - Marcus the Younger, Lady Anne Cotton, Hoghton family, Cotton family, Carleton family, straight coiffure, veil, ruff, partlet, bodice, slashing, square neckline, long full virago sleeves, slashed sleeves, back-flared cuffs, wast band, vee waistline, full skirt, shoes, mourning dress