What started as a Blair Waldorf revival – thanks to Prada and that iconic padded headband, hair accessories have quickly morphed into one of the biggest fashion trends of the last few years.

Prada sent 50-plus looks down the runway with padded silk and velvet headbands, Miu Miu similarly sported think crystal Alice bands, Simone Rocha’s version were super embellished, and Dior made ...