A Breton (or Bretonne) is a woman's hat with a round crown and a deep brim that is turned upwards all the way round, exposing the face.[1][2] Sometimes the hat has a domed crown.[3] Typically it is worn tilted to the back of the head.
The style first appeared under this name in the 19th century and was generally made of lightweight and malleable material such as straw or felt.[2] It is said to derive from the straw hats traditionally worn by Breton agricultural workers.[4] It is not to be confused with the Breton cap, a fabric cap with a peak at the front associated with fishermen.
Breton hat + fashion.