William Hogarth's (1697–1764) copper engraving shows the British Whig politician and author John Wilkes (1727–1797) with the pileus, the cap worn by Roman freedmen.
William Hogarth (1697–1764), John Wilkes Esq., copper engraving, 1763; source: The Metropolitan Museum of Art New York, accession number: 91.1.8.