Masterpiece at the Museo de Arte de Ponce: 'Dama a caballo' by Jose Campeche. José Campeche y Jordán, is the first known Puerto Rican visual artist and considered by many as one of the best rococo artists in the Americas.
1800 this is from a French language site, so I'm not sure these belts were worn in England. They were worn to prevent skirts from billowing up, but proved to be dangerous if the rider fell and were abandoned fairly quickly.
Lady Charles Spencer Sir Joshua Reynolds Oil on canvas. Born Mary Beauclerk the daughter of Vere Beauclerk, Baron Vere. Distinguished wife of Lord Charles Spencer who was Joint Postmaster General. The Goodwood Collection.