When deciding what to wear to a recent event at her law school, Fiza Faheem, 20, pored over the options in her wardrobe.

Many of her recent purchases had already gone out of style, at least by TikTok’s volatile standards.

Should she don the thin-framed glasses characteristic of the “office siren”? Or perhaps she could channel “dark academia” with a gothic blazer and black sheer tights? Should she stack her jewelry and put bows on her sleeves? Or should she opt for more of a “clean…