Well, in 'A Christmas Story', the pjs could be a symbol of the coziness of Christmas at home. They are likely to be warm and comfortable, which is important during the cold Christmas season. They also might have some sort of pattern or design that is typical of the era the story is set in, perhaps something like plaid or stripes, which gives a nostalgic feel to the whole story.
I'm not sure specifically which 'bunny pjs a christmas story' you are referring to. It could be a story about a bunny in pajamas during Christmas. Maybe it involves the bunny's adventures on Christmas Eve or Christmas day, like going to see the Christmas tree or getting presents.
One idea could be that the oc retains some memories of their past life. So they use their knowledge to change things in the pjs world. For example, they might know of a coming danger and work to prevent it.
Perhaps there is a dark force that is awakened by the oc's reincarnation. This force might have been dormant for a long time, and the oc's new life energy or something about their reincarnation stirs it. It could be a force that wants to destroy the balance of the pjs world, and the oc is the only one who can stop it because of their unique perspective from their past life.
One famous quote from 'A Christmas Story' is 'You'll shoot your eye out!' This line is often repeated in the movie and has become very iconic. It's a warning that Ralphie hears over and over again as he dreams of getting a Red Ryder BB gun for Christmas.