bowler hat
The bowler hat, also known as a bob hat, bombín or derby (USA), is a hard felt hat with a rounded crown, created originally during 1849. The bowler, a protective and durable hat style, was popular with the British and American working classes during the remaining 19th century, and later with the middle and upper classes in the United Kingdom and the eastern United States.
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This tag implicates hat (learn more).