A petasos (Greek: πέτασος) or petasus (Latin) is a broad brimmed hat of Thessalian origin worn by ancient Greeks, Thracians and Etruscans,^[1] often in combination with the chlamys cape. It was made of wool felt, leather, straw or animal skin. Women's versions had a high crown while those for men featured a lower crown.^[2] It was worn primarily by farmers, travellers and hunters, and was considered characteristic of rural people. As a winged hat, it became the symbol of Hermes, the Greek mythological messenger god.^[3]

Along with the pileus, the petasos was the most common hat worn in Ancient Greece.^[4] Its wide brim protected the wearer from the sun and rain while a lengthy strap allowed wearers to secure it under the chin. Its popularity later extended to the Etruscans, the Byzantine Empire and the Roman Empire, in slightly modified forms.^[5]

A type of metal helmet worn by Athenian cavalry was made in the shape of a petasos. Some examples have holes around the outer edge of the brim, presumably so a fabric cover could be attached. These are known from reliefs and vase paintings, with at least one archaeological example found in an Athenian tomb.^[6]

• Hermes wearing a petasos and bearing a caduceus
• Views of a petasos
• Petasos-wearing youth with spear and leopardskin
• Young warrior with a cloak and petasos dangling over the back
• Coin of Alexander I, struck circa 460-450 BC. Young male head right, wearing a petasos.
• Coinage of Kapsa, Macedon, circa 400 BC.

Wikimedia Commons has media related to Petasos.

• Clothing in ancient Greece
• Kausia
• Winged helmet