Leave it to Hailey Bieber to transform the groutfit into the season's most covetable and copy-worthy look. This weekend, the supermodel joined Bella Hadid at a Pilates class in Los Angeles, where she debuted a monochrome

gray fitness look that we'll be copying for the remainder of winter, both in and out of the gym.

To the class, Bieber wore a gray knit puffer from Prada, which she paired with a matching sports bra, Alo leggings (which just so happen to be on sale right now for under $70), and the New Balance x Aimé Leon Dore 550 sneakers that everyone—and we mean everyone—is trying to get their hands on. She also added a pair of DMY by DMY red-lensed sunglasses and a diamond body chain by Jacquie Aiche. Well, those and a pair of white athletic socks, of course. 

Though this is certainly not the first time we've seen Bieber use a workout as an outfit opportunity, it is rare that we can actually shop her look. Hell, even her sold-out sneakers are available in most sizes on the secondhand market. So before this look sells out just like everything else Bieber is spotted in, shop her groutfit below.