Onepiece is the brainchild of three Norwegians in their twenties – Thomas Adams, Henrik Norstrud, and Knut Gresvig. The idea behind the brand came to them in 2007 when the three men fantasized about the ultimate ‘chill-out’ wear on a hung-over Sunday, something perfect for lazy home days. By simply sewing together a hooded sweatshirt and a pair of sweatpants and opening it with a giant zipper, they created the first original Onepiece jumpsuit, a type of adult onesie.