Pajama or PJs originates from South Asia, then passed to the western world. Pyjamas are a soft type of clothing with loose gear. Some people find it relaxing to wear pajamas for sleeping, working around the house and loafing. That is the reason why pyjamas are known worldwide.
One more thing, Christmas is around the corner. It is five days to go when the Ber month starts. So, it's time to look for a LazyOne family matching Christmas pajamas. It is an advantage to buy (early) because you can choose a design and available size for the family.