Her article in thepeerage is here.
From Wikimedia.
Lady Emily wears a plain Empire style dress for her 1811 portrait.
Keywords: 1811, Lawrence, Emily Harriet Wellesley-Pole, Weelesley-Pole family, Countess, British, curly coiffure, floral headdress, chemise, sweetheart neckline, bodice, square neckline, quarter length close sleeves, waist band, close skirt, wrap