Forget Brat Girl Summer and the 'clean girl' aesthetic—this season, it’s all about Remy Bond. Music’s newest it-girl, often dubbed a “psychedelic Lana Del Rey” by those in-the-know, is rewriting the rules of cool with a look that feels straight out of a sun-drenched 1965 Miss Hawaii pageant.

From her cascading waves and cat-eye flick, Remy is the embodiment of the modern pin-up with a surf-glam twist. Her style? Think vintage halters,...