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One Direction have been wearing onesies designed by Swedish brand OnePiece since their X Factor days.

And now the boys have just released a playful handy-cam style video in collaboration with OnePiece where they run around and touch each other’s bee-hinds (and then some!) all while wearing their one piece jimjams.

One Direction Say Their Dolls Are Authentic

For the uninitiated, onesies are quirky pyjama jump suits.

Check out this cheeky footage of the 1D boys getting intimate and excitable in their onesies. Who knew a fuzzy jump suit could create such a frenzy!