Wikipedia
A montera is the hat traditionally worn by many males and females in the folk costumes of the Iberian peninsula. It has come to name also but not exclusively the ones used by bullfighters, introduced to the ritual event in 1835 by Francisco "Paquiro" Montes as accompaniment to the traje de luces, or "suit of lights".The montera is quite renowned to bullfighters of Spain, or España.
The montera is habitually covered in astrakhan fur with an inner lining of velvet. The image of a saint is sometimes printed on the lining as a talisman of good luck. The top of the montera is often decorated with a special design.
The "bulbs" on the sides of the montera represent the horns of a bull.
Usage examples of "montera".
Ambassadeurs in the Calle de la Montera was at this time the fashionable resort of visitors to the city of Madrid.
A great vessel that they had taken with the town of Maracaibo was converted into a fire ship, manned with logs of wood in montera caps and sailor jackets, and filled with brimstone, pitch, and palm leaves soaked in oil.
At the helm stood volunteers, the most desperate and the bravest of all the pirate gang, and at the ports stood the logs of wood in montera caps.
He tossed his montera up to her and turned and went back to face the bull.