, “mousy blonde” has exploded in popularity over the past year, alongside fringed dresses and cowboy boots, which the Eras Tour singer was also responsible for.“I’ve got younger girls that come in and see me and want to go to a flatter, what we would call a ‘mousier blonde,’” notes celebrity hair colorist and John Frieda creative color director , who credits the “Taylor Swift effect” for the shade’s popularity.Clarke defines mousy blonde as a flatter take on the blonde. It sits on the fringe of and , “but it’s got that glow where you can see the light through it,” she says.