Hair band
From Tardis Wiki, the free Doctor Who reference
Hair band is a item that Humans used to tie there long hair back so it did not get in the way.
Companions
Clara Oswald had a Hair Band that she used on the A113 to try and stop the Boneless but it did not work as the Boneless just destroyed the Train. (TV: Flatline)
Yasmin Khan used hair bands all the time to put her Hair in a Knot. (TV: The Woman Who Fell to Earth - The Timeless Children)