According to my ~sources~ (by that I mean the Internet, Pinterest, social media, and the occasional fashion show), hair scarves are going to be a big trend for 2017. Of course, hair scarves (or turbans or bandanas, as you might know them better) have been around forever. Women have been wearing scarves in their hair as an accessory and as a necessity for many, many years.
First you fold a square scarf into a triangle. Next you place the middle triangle on the top of your head. After that you take the two corners on each side and overlap them. The fourth step is twisting them together. The last step is pulling them back behind your head and tying them.