Simple Definition of sou'wester
: a hat that is worn when it rains and that is longer in the back than in the front and ties under the chin
: a long coat worn by sailors that keeps them dry during stormy weather
Full Definition of sou'wester
1 : a long oilskin coat worn especially at sea during stormy weather
2 : a waterproof hat with wide slanting brim longer in back than in front
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