With Bella Hadid opening the show and Kendall Jenner closing, Alexandre Vauthier bookended his Spring 2017 couture show at Paris Fashion Week with the most visible models around. The two women had just partied the night away at Dior's masked ball celebrating its 70th anniversary and Spring 2017 couture, where Hadid stole the show in a sheer, ethereal creation by Maria Grazia Chiuri. The next day, they were back on the job, arriving at the Grand Palais to rehearse the Vauthier show — albeit with decidedly lower-key looks than they would don for the runway itself. On Jenner, this meant leather flares paired with a t-shirt from Gosha Rubchinskiy's Spring 2017 menswear collection. The piece, pulled from his Fila collaboration, first walked at Pitti Uomo in Florence, Italy; the Russian designer's take on classic sportswear is just the latest in a series of designer collaborations reviving vintage sportswear staples. (Think Vetements' collaborations with Champion and Juicy Couture, or Opening Ceremony's Esprit capsule collection.)

Kendall Jenner in Gosha Rubchinskiy x Fila and Unravel in Paris, France, January 2017.

Marc Piasecki/Getty Images

Who: Kendall Jenner.

When: Tuesday, January 24.

Where: Arriving at the Alexandre Vauthier Spring 2017 couture show at the Grand Palais in Paris, France.

What: Wide-leg leather pants by Unravel, a shearling and denim jacket, and a black graphic t-shirt from Gosha Rubchinskiy's Fila collaboration for Spring 2017.

Why: As fashion month wears on, models everywhere take the opportunity to show off not just their runway chops, but also their personal style. While Jenner isn't beholden to any one designer, it's still a bit of a bold move to show up at a runway rehearsal in a t-shirt bearing another designer's name (let alone two other brands' names). Jenner pairs a men's tee and androgynous, oversized denim-and-shearling coat with curve-hugging flare leather pants and plimsolls, combining traditionally masculine and feminine elements into one look that's very sporty and very '70s. (The Italian-Korean Fila reached peak popularity with the tennis pros of the '70s, while the flare silhouette can't help but read retro, even 40 years later.)

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