Mary-Kate and Ashley Olsen have been tucking their hair into their coats since at least 2004, when photographs from that era show the pair hiding low ponytails under buttoned jackets and fur collars. Nobody called it anything back then. It was just how they looked: slightly undone, entirely deliberate and completely their own. But recently, this habit has quietly acquired a name – one that has spread fast enough to reach runways and front rows.

The Olsen tuck is, at its most literal, the act of tucking your hair into a sweater, scarf or coat collar so it disappears into the neckline. The result is a faux bob silhouette that frames the face and clears everything below the chin – which sounds simple until you see how much it changes a look.

“It’s a styling technique … that creates a clean, contained silhouette,” says Dean Banowetz, celebrity hairstylist and founder of the Hollywood Hair Guy Academy. “It removes volume at the neckline and directs the eye upward to the face” – which in turn draws attention to outerwear, earrings and the bone structure that usually gets buried under a curtain of hair.

Ashley even took it to the Met Gala in 2017, tucking her hair into a lime-green feather-embellished Christian Lacroix jacket. According to her long-time hairstylist Mark Townsend, she liked the look of it while putting the jacket on.

But the real story behind this trend is a little blurry. The Olsens might be the most obvious origin, but Phoebe Philo, the British designer who ran Celine from 2008 to 2017, was doing it too, styling her models with their ends tucked into coats and turtlenecks throughout the early 2010s.

The look also surfaced on runways like Calvin Klein and Altuzarra, and during the Saint Laurent spring 2026 at Paris Fashion Week, it turned up across the whole front row: Madonna arrived with her wavy blonde hair loosely trapped under a leather collar, while Renée Zellweger, Anja Rubik and Zoë Kravitz sat with their hair similarly swept beneath their outerwear.

But what separates a good tuck from one that just looks like you forgot to shake your hair out when you put your coat on? It comes down to prep and texture. “An intentional tuck still feels effortless, but there is a clear decision behind it,” says Marcos Diaz, New York-based celebrity hairstylist whose clients include Hailey Bieber, Sienna Miller and Katy Perry. “The hair has the right amount of texture, the placement is considered, and the silhouette works with the neckline or coat. When it’s accidental, it tends to collapse or feel disconnected from the overall look.”