Onesie (jumpsuit)
A onesie () is a type of loose-fitting casual jumpsuit in adult sizes made of knit cotton (as used in sweatshirts), fleece, or chenille. They were mostly intended as loungewear or sleepwear, but have gained significant popularity as stylish streetwear, especially in the United Kingdom and Australia, becoming increasingly popular during the late 2000s and early 2010s as a street fashion.