What if I told you that sweatpants could look polished enough for the hottest spot in town? Would you believe me? You don't have to. Sienna Miller just proved it.

This week, as she left Erewhon—the place to be and be seen in L.A.—Miller was photographed wearing light-gray jogger-style sweatpants, a darker gray crewneck sweatshirt, and black flip-flops. She accessorized with a Bottega Veneta bag and oversize sunglasses, offering an easy way to elevate a casual look.

Let's talk about the specific color of sweatpants she chose. As a style icon and a postpartum mom likely prioritizing comfort, she probably has a range of sweatpants, but her choice of light gray felt intentional. The shade is just as versatile and classic as black but has a more understated appeal. Plus, when paired with another piece in the gray color family to create a "groutfit," it gives off relaxed, effortless vibes.

You don't have to be postpartum to wear gray sweatpants beyond the house. As a 30-year-old fashion editor, I love styling mine with a white tee, a suede or leather jacket, and loafers for everything from travel to running errands around the city. If you're looking to refresh your loungewear drawer, keep scrolling to shop the best gray sweatpants.

(Image credit: Backgrid)

On Sienna Miller: Bottega Veneta bag

Shop Gray Sweatpants

SKIMS Cotton Fleece Blend Joggers

You can't go wrong with Skims loungewear.

LE BOP Scuba Barrel Sweatpants

Shopbop's in-house brand Le Bop makes the best elevated basics.

Rachel Comey Lintic Pants

Obsessed with the small details such as the buttons, belt loops, and low-slung pockets.

Varley The Classic Cuff Pants

The thick waistband will make you feel very supported.

Marine Layer Cloud 9 Fleece Sweatpants

Adding to my cart ASAP.

Almina Concept Sweatpants

Fashion editors and insiders in NYC and L.A. can't stop wearing Almina Concept.

ETERNE Straight Leg Sweatpants

The low-rise, relaxed fit feels effortlessly chic.

gap VintageSoft Terry Loose Sweatpants

I'd wear these around the house too.

Suzie Kondi Paxos Sweatpants

This pair feels vintage in the best way.

leset Nando Lounge Pants

These aren't technically "sweatpants," but they're lounge pants worth adding to your wardrobe.