From striped sets to reindeer-printed onesies ... for matching family PJs, the donning of which has become mainstream everywhere from department store catalogs to Christmas cards.

Tyler Essary/NBC/NBCU Photo Bank via Getty, Paige Drummond/Instagram Ree Drummond's Christmas was merry ... a selfie of some of the family members wearing onesie pajamas. In the snap, Jamar ...

Kate Hudson just shared her family Christmas ... wearing red holiday onesies; and Hawn holds Rani and another granddaughter in another snap in matching pink pajamas. In another photo, Rani poses ...