Kaia Gerber, Kendall Jenner, and Jennifer Lopez Share an Athleisure Uniform

A-listers are known for their red carpet style, but I'm more interested in what they wear on their days off. Think: Kendall Jenner's date-night trench, or Kaia Gerber's favorite Birkenstock clogs. With access to just about any brand in the world, what key pieces do celebrities become—and stay—loyal to?

Athleisure is a particularly interesting category here: Celebrities don't always expect to be photographed leaving the gym, so they're often snapped wearing workout sets, leggings, and sneakers that just work for them. Ahead, you'll find the Alo leggings Olivia Wilde adores, the designer sneakers J.Lo always wears, Kendall Jenner's Nike favorites, and more. If you're looking for a workout wardrobe refresh, why not turn to some of the most fashionable people out there?

Olivia Wilde

Olivia Wilde has been photographed time and time again in her unofficial workout uniform: Alo Airlift Leggings and colorful sneakers from either Hoka or Adidas. The Airlift leggings, which Hailey Bieber and Martha Stewart also love, are designed for high-intensity workouts, boasting high-compression fabric and a sleek subtle sheen. Meanwhile, Wilde's go-to Hoka sneakers have an ultra-cushioned footbed but feel lightweight, so you're able to run, train, walk, or hike for hours on end without discomfort.

Jennifer Garner

Alo strikes again: While Olivia Wilde loves the brand's shiny Airlift leggings, Jennifer Garner's favorite leggings are the Vapor. Aside from the cool print, they're form-flattering with a compressive and lifting effect, plus they feel buttery soft. On the shoe front, Garner tends to stick to bold and bright runners, with Altra and Saucony among her go-tos.

Alessandra Ambrosio

Add Alessandra Ambrosio to Alo's long list of celebrity shoppers. The pretty pastel leggings she often wears come from Alo, but Ambrosio doesn't just stick to one style: She loves both the Airbrush leggings, which feature a soft, breathable knit, and the ribbed pocketed version of the Airlifts. As for her footwear, Ambrosio most often wears chunky New Balance sneakers with tube socks.

Kaia Gerber

Meanwhile, Kaia Gerber turns to cult-favorite athleisure brand Gym Shark for neutral, comfy leggings. She's been seen wearing the brand's Vital 2.0 Seamless Leggings, which feature sweat-wicking fabric and breathable mesh, but she's also been spotted in the Marl Seamless Leggings. Footwear-wise, Gerber often wears Nike's Free Metcon sneakers, or dad sneakers from Asics.

Kendall Jenner

Kendall Jenner often wears Nike's Dri-FIT yoga leggings, pairing them with Nike sneakers. Though her matching orange sneakers were a limited-edition collab, you can still scoop up a similar look.

Hailey Bieber

Leave it to cool girl Hailey Bieber to make leggings and sneakers look, well, cool. Bieber's trademark chic off-duty style extends to her workout wear: she favors sleek black leggings, of-the-moment flared yoga pants, and colorful chunky sneakers. Favorite brands of Bieber's are Set Active, an elevated athleisure line loved by Gerber, and New Balance.

Jennifer Lopez

Even in leggings and sneakers, J.Lo is as glamorous as ever, often opting for designer sneakers and shiny metallic pairs. While J.Lo's favorite Beyond Yoga leggings are sold out, you can steal her look with the brand's other prints. Footwear-wise, Lopez often wears Prada Cloudbust Thunder sneakers, and she's also worn sneakers from ON in the past.