What is the purpose of a Doo rag?

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I always assumed it was a dew rag not a doo rag, with dew referring to sweat. That's always the context I would see it used in.

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Do-rags re-emerged as an urban fashion trend during the 1990s and 2000s, first among African Americans, who used them to maintain their new hair styles. ... Do-rags are regularly used to create and maintain waves and cornrowed hairstyles.

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During the slavery period in the United States, African American women wore scarves that were later to become the do-rags of the 1930s to the 1960s. Do-rags were also used by African American men to hold chemically processed hair-dos in place while they slept. Originally they were most commonly made from women's stockings; these were called stocking caps, not do-rags. Now, many are made from polyester. Do-rags re-emerged as an urban fashion trend during the 1990s and 2000s, first among African Americans, who used them to maintain their new hair styles.

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