
A cavalier hat is a variety of wide-brimmed hat popular in the seventeenth century. These hats were often made from felt, and usually trimmed with an ostrich plume. They were often cocked up or had one side of the brim pinned to the side of the crown of the hat (similar to the slouch hat) which was then decorated with feathers. Cavalier hats get t...
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http://en.wikipedia.org/wiki/Cavalier_hat

A wide-brimmed, plumed hat worn by cavaliers in the 17th century the right side of the brim was pinned up to the crown so that the wearer's sword arm could move freely above the shoulder.
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http://www.encyclo.co.uk/local/21746

The cavalier hat was a large hat with a moderate crown and a broad brim turned up at one or both sides, worn by men in Britain during the 17th century. The Cavalier hat was often adorned by a large feather on one side. This style of hat was popular among the Cavaliers of the time, while the rival sugar-loaf hat was more popular among the Puritans.
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http://www.probertencyclopaedia.com/browse/PC.HTM

[
n] - a soft felt hat with a wide flexible brim
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http://www.webdictionary.co.uk/definition.php?query=cavalier%20hat
slouch hat noun a soft felt hat with a wide flexible brim
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https://www.encyclo.co.uk/local/20974
No exact match found.