Jessica Alba has her street style down to a science, and that includes a chic alternative to sweatpants. After all, sometimes even celebs want to be comfy!

Spotted out and about in NYC over the weekend, Jessica sported a pair of slouchy gray drawstring pants -- not quite sweats, but nothing too fancy, either. She paired her casual bottoms with a t-shirt and printed jacket, but these guys can be dressed up easily with a button-down or fancier top. The material is soft and silky, making the pants sophisticated, but most of all, ultra-comfortable.

Ever since Karl Lagerfeld sent models in sneakers and fanny-packs down the runway at last year's Chanel haute couture show, comfort has reigned supreme in the fashion world. It's no surprise style-savvy celebs like Ms. Alba are catching on. We've seen quite a few pairs of these not-quite-sweatpants, but have our eye on this one from J.Crew, with a cute ikat print. Wither thrown over a bikini at the beach, or paired with heels for a night out, this versatile style is going to be our summer staple.