Endymion (some say it's Adonis) wears a hat, a Roman tunic, and sandals and naps on Mount Latmos. The original marble Roman sculpture dates from the 2nd Century C.E., where the drawing is based and is located in the British Museum in London.
Source: The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Picture Collection, The New York Public Library. "Ancient styles of hats" The New York Public Library Digital Collections. 1845. This image is in the public domain.