Billie Eilish's Newsboy Cap and Plaid Skirt Make For Her Most '90s Outfit Yet

Billie Eilish has been leaning heavily into the '90s when it comes to her looks as of late, always sprinkling them with an extra dose of personality. The 20-year-old musician exuded what can only be described as the epitome of retro grunge when she shared a selfie to her Instagram Stories on Monday, Nov. 21. Holding up her phone to the mirror in what appears to be a practice room or recording studio, Eilish kicks one leg out in front of her, presenting throwback trends from tip to toe.

In the photo, Eilish wears a plaid midi skirt with a cargo pocket on each side. She teamed it with an oversize black polo shirt in true borrowed-from-the-boys fashion, with a cream-colored grandpa cardigan worn open on top. Eilish's element of surprise comes courtesy of a contrasting plaid newsboy cap and sporty Nike sneakers, which she complemented with white ribbed ankle socks.

Though Eilish has always opted for head-turning looks both on and off the red carpet, she has gone through quite a style evolution that has led her to settle on experimenting with her own take on the early-aughts aesthetic. Her latest fragrance release pictures her in a deconstructed crochet minidress from Elaine Lip styled over a crop top designed by Ren Haixi. Before that, she and beau Jesse Rutherford chose to twin in boudoir looks covered in the iconic Gucci logo at the LACMA Art+Film Gala on Nov. 5. While she was still on tour, she peppered in some more casual day-to-night dressing in the form of graphic tees and hip-slung pants.

If you're looking to master Eilish's latest '90s look and effortlessly bring retro grunge back into your wardrobe, shop the following pieces.