From Google search. This may originate with abc gallery that states it is in a private collection.
Kitty sports a feathered hat and a coat over a dress with a high neckline and ruff in this Lawrence portrait.
Keywords: Lawrence, Catherine Pakenham, Kitty Pakenham, Catherine Wellesley, Duchess of Wellington, Pakenham family, Wellesley family, Duchess, British, curly coiffure, feathered cap, bodice, high enclosing neckline, ruff, long sleeves, ruffled cuffs, coat, vee neckline, lapels, long tight sleeves, bracelets