How we wore them in 2000: String-tie tops were most often worn with sporty bottoms, like joggers or track pants, but the other most common variation of this trend was the whale tail (*shudder*), achieved by pulling the back of your thong undies up over the waist of your low-rise pants.

How to wear them in 2021: The 2021 verison of this midriff-baring trend is much simpler and has nothing to do with underwear (thank God). Rather than bikini-inspired tops, we’re rocking cropped T-shirts or puff-sleeve blouses with a simple wrap-around feature at the waist. Pair them with a high-waist slip skirt, just like Taye Hansberry’s matching set, or with Bermuda shorts, skinny jeans or even leggings.

Shop similar styles: AsYou top ($24); Superdown top ($44); Wayf top ($48); Lioness top ($79); Jonathan Simkhai dress ($395)