There’s a scene about half-way through Call Me By Your Name—the new film by Luca Guadagnino—when the young protagonist Elio (played by Timothée Chalamet) sneaks into the room of Armie Hammer’s Oliver, a graduate student staying at his parents’ Italian villa, and places his head inside one of Oliver’s swimsuits. The scene displays Elio’s tense romantic longing and adolescent frustration, but another feature about the strangely-sweet moment stands out—the swim trunks are perfect. They’re a classic shade of red, a bit short, and squarely ’80s. You probably wouldn’t want to put them on your head, but they’ve got the nostalgic vibe that is so resonant in fashion in 2017.

The person responsible for Call Me By Your Name’s pitch-perfect style is costume designer Giulia Piersanti, who is rapidly making a name for herself in the cinematic world. Call Me By Your Name is only Piersanti’s second film, but her first was Guadagnino’s A Bigger Splash, one of the most stylish movies of 2015. And her day job? Knitwear designer at Céline (with previous stints at Balenciaga, Dior Homme, and Missoni), which prepares her well for the role. Piersanti is already signed on for Guadagnino’s next film.

Timothée Chalamet, director Luca Guadagnino, and Armie Hammer on set. Photo by Peter Spears, Courtesy of Sony Pictures Classics

Though the swim trunk-sniffing is one of the more striking examples, Call Me By Your Name is full of scenes where the clothing rises above mere adornment. Close-ups in the film are not limited to the actors—the camera lingers on those bright swimsuits and billowy button-down shirts throughout. The clothes, particularly the ones worn by Chalamet and Hammer, are the perfect uniform for their dreamy Italian summer.

Call Me By Your Name arrived at Sundance an immediate festival darling and has now transitioned into a full-fledged awards contender. As the film makes its way into theaters, Piersanti gives us insight into her process.