The painters didn't know this was inaccurate. This continued to be the case through the Renaissance--e.g. Veronese, The Wedding at Cana. Historicism in painting was made possible by the rise of antiquarianism, nascent in the Renaissance and fully developed by the 18th century, which introduced the sense of the historical change of material culture and fashion. It became widespread and a desideratum in history painting only from the middle of the 18th century, when neoclassicism emerged, antiquarianism become increasingly sophisticated, the scientific study of ancient artifacts began to be practiced, and critics and representatives of the European art academies began to demand historical accuracy of costume, architecture, etc. in history painting.

Hugh Honour, Neoclassicism (1968)