This may well be the definitive portrait of the Princess, but I do not know artist or provenance.
Posted to The Royal Forums by Marengo on 6 September 2007.
Her ruff/cherusque arises from an circular open collar surrounding the neck, almost like dresses worn by Isabel Clara Eugenia 200 years earlier. Norris and Oswald describe an incident in 1814 where she went to a party topless in pp. 24-25 of Nineteenth-Century Costume and Fashion, 1998 Dover re-issue. Her accordion sleeves are in the "mameluke" style with multiple puffs. Mamelukes were members of a warrior caste encountered by Napoleon's forces in the Egyptian campaign.
Keywords: Princess Charlotte of Wales, Welf family, Wettin family, Princess, British, curly coiffure, floral headdress, bun, high neckline, modesty piece, neckline ruff, mameluke sleeves, Empire low waistline, close skirt, necklace, earrings, brooch, robes