Christopher Polk for WWD

Billie Eilish brought menswear-inspired fashion to the “Barbie” world premiere on Sunday in Los Angeles.

The singer took a Y2K approach to Barbiecore dressing, arriving on the star-studded event wearing a pink pinstripe button-down by Gucci, black Raf Simons shorts, a pointy pink tie and clear-colored Erl sneakers.

Styled by Lana Jay Lackey, Eilish coordinated her look with pink slouch socks and a beige Raf Simons sweater that featured a “B” embroidered on it. For a touch of glam, the singer also toted the Pink Hazel handbag by Vivienne Westwood.

Eilish will release her recent single, “What Was I Made For,” on Thursday. The song is an element of the “Barbie” movie soundtrack.

“We made this song for Barbie and it means absolutely the worrrllld to me. This movie is gonna change ur lives and hopefully the song will too. Get able to sob,” she wrote on Instagram on Friday.

“Barbie” sees Mattel’s famous doll on a journey from Barbieland to the true world. The film, which debuts in theaters on July 21, features an ensemble solid including Margot Robbie, Ryan Gosling, Will Ferrell, Emma Mackey, Dua Lipa, Hari Nef, Simu Liu and Ncuti Gatwa. The movie’s soundtrack is just as star-studded, featuring tracks from Charli XCX, Tame Impala, Ice Spice, Lizzo and Haim.

Gerwig cowrote “Barbie” together with her longtime partner Noah Baumbach. The couple previously collaborated on the screenplay for his or her 2012 dramedy “Frances Ha.

PHOTOS: See all of the looks from the “Barbie” premiere in Los Angeles.