Plazacore is a fashion microtrend that originated on TikTok and Instagram in the early 2020s. The aesthetic is a modern reinterpretation of a classic Preppy , "Upper East Side" style, characterized by its combination of playful, youthful elements with sophisticated and elegant garments. The name is a direct reference to the Plaza Hotel in New York City, the setting for the iconic Eloise children's book series.

The aesthetic is heavily inspired by the whimsical yet luxurious lifestyle of the book's protagonist, a mischievous little girl who lives in a suite at the Plaza. This is often blended with the polished, schoolgirl-inspired fashion of another iconic fictional New Yorker, Blair Waldorf from Gossip Girl .

The Plazacore aesthetic originated on social media, where fashion influencers began to popularize a look that combined nostalgia for the Eloise book series by Kay Thompson and the TV show Gossip Girl . The character of Eloise provides the aesthetic's whimsical hotel-centric fantasy, while Blair Waldorf provides the blueprint for its polished and colorfully accessorized fashion.

The trend gained popularity from runway collections that featured Plazacore elements. Designers like Thom Browne and Bora Aksu presented collections with pleated skirts, bows, and tweed twin sets, while Chanel's continued focus on tweed has also been cited as a major influence.

Plazacore fashion is a curated combination of classic preppy staples with youthful and feminine details. It revolves around high-quality fabrics and structured silhouettes.

The primary element of the Plazacore wardrobe is tweed, most often seen in matching blazer and skirt sets. Babydoll dresses, particularly those with exaggerated Peter Pan collars and puff sleeves, are another key garment, directly referencing the look of Eloise. Other popular items include cape coats, cardigans, and high-waisted shorts. The most common patterns are classic preppy prints like houndstooth, plaid, and gingham.

Accessories are essential in the Plazacore aesthetic. Hair bows and headbands are the most iconic accessories, a direct nod to Blair Waldorf's signature style. Pearl jewelry, such as necklaces and bracelets, adds a touch of classic elegance. Tights, either opaque in white or a bright color, are frequently worn with skirts and dresses. Footwear is typically classic and feminine, with Mary Janes and ballet flats being the most popular choices.

The color palette is diverse, oscillating between soft pastels (like powder pink, baby blue, and mint green) and bolder, more traditional preppy shades like bright red, royal blue, and forest green. The classic combination of black and white is also a staple of the aesthetic.