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Douglas Harper's Etymology Dictionary
do-rag

by 1973 (said to date to 1960s in DAS), Black English, from hairdo + rag (n.).

Wiktionary
do-rag

n. A piece of cloth used to cover the head.

Wikipedia
Do-rag

A do-rag (also spelled variously as a doo-rag, dew-rag, du-rag or durag), is a piece of cloth used to cover the top of one's head, sometimes made of nylon material and having a "skullcap" fit. It may also be referred to as a " wavecap". According to the Oxford English Dictionary and Merriam-Webster dictionary, the term derives from 'do as in hairdo.

Usage examples of "do-rag".

Maurice said it was too cold to be outside, the dude in his lilac do-rag and tailored black pea jacket, enough shoulders in the coat for White Boy Bob-White Boy wearing a wool shirt hanging out over his T-shirt-coming behind them up the ramp to the front door of the Kronk Recreation Center at McGraw and Junction, a two-story red-brick building that looked to Glenn like a public library no one used in a poor section of town.

I got some shades in my pack and a bandana I can like tie like a do-rag?