Banish from your mind the idea that plimsolls (AKA slip-on sneakers) are solely for older people to play sports in. Unlearn that the plimsoll is a kind of novelty throwback item. With a new generation of stylish A-listers – Justin Bieber and Brooklyn Beckham to name just two – rocking them on the regular, it’s time to cop yourself some serious slip-ons for spring.