If you turn to TikTok for fashion advice, chances are you’ll probably have to sift through some unintelligible internetspeak in order to find helpful tips. One of the biggest shifts in modern fashion terminology has been the rise of “aesthetics” and “cores,” sartorial genres that attempt to categorize your wardrobe into searchable—and marketable—themes. Wear a lot of hot pink? That’s probably “Barbiecore,” a nod to last summer’s blockbuster. Are you into vintage blazers and relaxed J.Crew vibes? You might be an “old money girl.” But whether it’s “mermaidcore,” “eclectic grandpa,” or “coastal cowgirl,” these niche fashion trends often rise and fall in a matter of weeks, making them difficult for average consumers to keep up with. This summer, a hot new bombshell has entered the villa:…