The singer, 34, who welcomed son Arthur in May, looked nothing short of sensational as she strutted her stuff in a casual black sweatshirt, which she teamed up with a ruffled mesh skirt.

the uniform (quite literally) for this youthful aesthetic is comprised of a few key staples, namely, dress shirts, blazers, and plaid skirts ... Moody black is perfect for fall — or any time ...

It's crazy to believe that season after season, we seem to find new ways to wear the classic skirt. Denim minis are being deconstructed (they look like jean jackets tied around the waist!) ...

Swift sported an oversized Louis Vuitton sweatshirt and matching beanie to ... Underneath the jacket, she wore the notable black skirt and red tights and completed the ensemble with black combat ...

She opted for a vintage purple-and-gray NYU collegiate sweatshirt and a black pleated miniskirt finished with tan leather sneakers from the Olsen twins' NYC-based label The Row. Swift accessorized ...

Vikander instead styled hers with a gray sweatshirt—albeit ... choice for both of these outfits, the pop of black from underneath their skirts made for a nice feature. WWD/WWD/Getty Images ...

You can pair a sweatshirt with anything—a skirt, matching sweatpants, or jeans—and feel comfortable, and most importantly, warm. Bonus points if it’s made with the earth in mind. ByKristen ...