Aliyahcore is a fashion microtrend that originated on TikTok in the early 2020s, created and popularized by the Atlanta-based content creator Aliyah Bah (aliyahsinterlude). The aesthetic is defined by a specific and reproducible formula that combines elements of Y2K , alternative , and Japanese Harajuku fashion influences into a singular, eccentric look.

Aliyahcore is a philosophy of confident and unapologetic self-expression. As defined by Bah herself, it is a "lifestyle & fashion trend that allows you to wear whatever you want and not care about being perceived." While originating from a single person, the style has been widely adopted by her followers, becoming a significant trend within the online Black alternative fashion community.

Aliyah Bah began posting her unique outfits on TikTok during the 2020 pandemic lockdowns. Her dynamic and unconventional style, which she developed through years of thrifting and DIY customization, quickly gained a large following.

In late 2022, Bah officially coined the term "Aliyahcore" to describe her signature look. The hashtag went viral, amassing hundreds of millions of views and inspiring thousands of followers, particularly other Black creators, to post their own interpretations of her style. The trend's success propelled Bah into the mainstream fashion world, leading to modeling opportunities, collaborations with brands, and work styling other musicians and celebrities.

Aliyahcore is significant for its role in promoting visibility for Black women and girls within the alternative fashion scene, a space where they have historically been underrepresented. The trend has been celebrated for creating a safe space for Black youth to explore creative expression outside of mainstream cultural expectations.

However, the trend has also sparked some debate within the Black alt community. While Bah is widely credited with popularizing and naming this specific look, some have expressed concern that labeling the broader Black alternative aesthetic as "Aliyahcore" risks erasing the contributions and unique styles of other creators who came before her.

The Aliyahcore aesthetic is defined by a specific formula of layered garments and accessories, creating a look that is both playful and edgy. The style is built upon a base of Y2K-inspired clothing, which is then heavily accessorized.

According to Aliyah Bah, the look begins with a miniskirt or very short shorts. This base is then layered with what she calls the "Aliyahcore essentials": fishnet stockings (often worn on one leg and as sleeves on both arms), a garter belt, fur-trimmed platform boots (such as those by Demonia), and earmuffs, which are worn year-round as a signature accessory. Other common elements include layered belts with rhinestones, fuzzy leg warmers, and makeup that coordinates with the color of the outfit.

The aesthetic is a self-described "hodgepodge" of influences. The silhouettes and items like miniskirts and crop tops are rooted in Y2K fashion. The use of fishnets, platforms, and a generally rebellious attitude draws from alternative and grunge styles. Finally, the playful, colorful, and accessory-heavy approach is heavily inspired by Japanese Harajuku street style.