Xbox Onesie was revealed a few months ago by Xbox Australia. Xbox team in the US gave away few of them as they got a ton of inquiries from fans about how to get it in the US. If you didn’t get a chance to own it physically, you can now own it virtually. The Xbox Avatar Store team have created the Xbox Onesie avatar items, designed to look just like the real ones. All of these Avatar items are free.
Here are links where you can download the Xbox Onesie Avatar items: