British royal ladies (and a Queen of Prussia) back around 1805, all in gowns with the fashionable empire waistline popularized by and named for their arch enemy the Empress Josephine. Peter Edward Stroehling, painter (1768-ca. 1826). He started out painting in Russia but later painted in London.

Portrait of Charlotte of Mecklenburg-Strelitz (1744-1818) Wife of George III. 1807. Oil on copper. Peter Edward Stroehling, painter (1768-ca. 1826). Royal Collection Trust. In the public domain in the United States because the artist died over 100 years ago. via https://commons.wikimedia.org/wiki/File:Stroehling_-_Queen_Charlotte,_1807,_Royal_Collection.jpg
Louise, Queen of Prussia. ca. 1797-1803. Oil on copper. Peter Edward Stroehling, painter (1768-ca. 1826). Collections of and image Royal Collection Trust/© His Majesty King Charles III 2022. Artwork itself in the public domain due to age. https://www.rct.uk/collection/search#/2/collection/404867/louisa-queen-of-prussia-1776-1810
Princess Amelia. 1807. Oil on copper. Peter Edward Stroehling, painter (1768-ca. 1826). Incised on the back with the name of the artist and sitter and ‘done at Windsor 1807’. Collections of and image Royal Collection Trust/© His Majesty King Charles III 2022. Artwork itself in the public domain due to age. https://www.rct.uk/collection/search#/6/collection/404871/princess-amelia-1783-1810
Frederica, Duchess of York. 1807. Oil on copper. Peter Edward Stroehling, painter (1768-ca. 1826). Collections of and image Royal Collection Trust/© His Majesty King Charles III 2022. Artwork itself in the public domain due to age. https://www.rct.uk/collection/search#/12/collection/405046/frederica-duchess-of-york-1767-1820
Princess Sophia. 1807. Oil on copper. Peter Edward Stroehling, painter (1768-ca. 1826). Incised on the back with the name of the artist and sitter and ‘done at Windsor 1807’. Collections of and image Royal Collection Trust/© His Majesty King Charles III 2022. Artwork itself in the public domain due to age. https://www.rct.uk/collection/search#/10/collection/404864/princess-sophia-1777-1848