Would not I have been my first Onesie not sent him back. So I know that Onesies are generally slightly larger / cut. This one, however, a 185cm / 80kg man is almost too big even with XS / S (EXTRA SMALL / SMALL !!!!). Bündchen but are in turn so tight that sleep a nearly hands. The zipper goes to the end of the hood, weigh down heavily when it lies down. And finally the material => fluff it without end. I do not think once / twice / wash ... here sufficient, which is likely to remain rather for ne lannnnggee while. I as a seller would put ne big pack Glue Roller from Ikea to each Onesie :)