In terms of adult fashion, the word onesie is commonly used for loose-fitting casual jumpsuits made of knit cotton (as used in sweatshirts), fleece, or chenille. They are mostly intended as loungewear or sleepwear, but have gained significant popularity as stylish street fashion. Many designs feature roomy hoods, thumb loops, or closed feet.
Onesies have recentely become an extremely popular fashion. Onesies are sold in through various avenues. Commonly, onesies can be found in shopping centers or online shops such as eBay. Onesies come in many sizes and patterns, from polka dots to anime animal characters.
Onesies for adults were developed in the USA where they are more commonly know as footed pajamas and where there are several companies specializing in their manufacture. . Adult onesies have appeared on USA TV show such as Scrubs and Friends in 2007. 
OnePiece, a company founded in 2007 by three Norwegian students, has been credited with popularising the garment as a piece of lifestyle fashion. Nowadays, however, several on-line businesses and department store chains sell adult onesies.
- Adult Onesies: The Dress Like A Toddler Trend Claims Further Victims. Blog entry in The Fashion Police dated 2008-09-08. Accessed 2013-03-09.
- Link. "OnePiece on Facebook".
- Lifestyle. "The onesie: an all-in-one garment reviewed". Telegraph. Retrieved 2013-01-21.
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