I have never gone as far as a onesie
But...uh thanks for sharing.
I guess people are a bit unsure about what constitutes pyjamas. Here's a bit of sartorial information for those who need to know.
Pyjamas originally came from India. They are a two-piece garment consisting of a long sleeved button shirt top (often with breast pockets) and matching trousers/pants, either elasticised/or drawstring and usually made of cotton. For those living in colder climes, they are usually made of flanellette which is a soft, brushed cotton that is very comfortable to wear/sleep in.
The patterns on pyjamas have traditonally been stripes. But you can have any pattern on them but the rule is they have to match to be real pyjamas.