Panama hat

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A natural-colored, hand-plaited hat made from leaves of a palmlike plant (Carludovica palmata) native to South and Central America.

from the GNU version of the Collaborative International Dictionary of English.

• A fine plaited hat, made in Central America of the young leaves of a plant (Carludovica palmata).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A type of brimmed hat from South America, originally made with straw.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a stiff hat made of straw with a flat crown