There's no denying that 2016 was the year everyone somehow, magically, seemed to own a one-piece swimsuit. You don't have to look too far on the 'gram to see that stars from Shay Mitchell to Hailey Baldwin all chose to rock this style in every colour, cut, and material available. It was like your holiday wasn't complete unless you slipped into a sexy monokini (with side cutouts, if you dare). The photos ahead won't let you forget what swim style ruled the beach and the pools.