Leave it to Bella Hadid to modernize the "bump it," the controversial 2000s-era hairstyle that's now making a comeback.

Casual or Active Day? Messy bun for a quick and easy, laid-back look. Formal or Professional Event? Make a statement with a crisp bun. Short on Time? Messy bun wins for convenience. Desire to Impress?

Lately, everyone’s been buzzing about the so-called “return” of the messy bun. Sure, it’s having a moment—Miley Cyrus even rocked one at the Golden Globes—but let’s be honest: It never really went ...