When I was a teenager in the 1960s, bell-bottom pants were popular. I remember the last time I wore them, they had shifted in my mind from looking cool to ridiculous.

As a fashion icon, there aren’t many trends that Bella Hadid won’t participate in. After all, she’s been a fervent adopter of the Y2K aesthetic, the “ugly” shoe craze, and the free-the-nipple movement ...