Still on her world tour, Billie Eilish is currently making a stop in Sydney, Australia, where she pulled out her best "Clueless"-inspired wardrobe. Sharing a selfie on her Instagram Stories, Eilish showed off a white button-down shirt and a green-and-black striped sweater vest that she wore on top. Fans of the beloved '90s film will recall that Cher Horowitz was a fan of the preppy sweater vest look as well, but favored hers with pleated skirts and knee socks. While the rest of Eilish's throwback ensemble isn't in visible in the specific snapshot she shared, it's possible that she styled the layered tops with something similar.

Layering, of course, is a summer-to-fall transition styling trick that ensures you get the most out of your wardrobe year-round. Vintage pieces like sweater vests and worn-in sweaters are ideally suited to layering, too, so it makes sense that Eilish has been leaning toward an assortment of '90s- and '00s-inspired fashion lately. She just posted a carousel of images where she was sporting sweat sets, slip dresses, and off-the-shoulder dresses while she was spending time in Tokyo. And, before that, she was spotted in a high-slit vintage lace slip skirt and moon boots during a stop in Singapore. The 20-year-old "Happier Than Ever" singer even leaned into the '90s logomania trend in the photos for her Gucci Eyewear campaign, wearing a sheer mesh top with the design house's interlocked G print all over.

Since Eilish's tour is still underway, there will likely be many more throwback outfits to look forward to in the near future.

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