My mom made us kids rag dolls that we could put our pjs inside the tummy. She had a slit in the back of the doll and we would snap it shut.
When our kids were little, we taught them to fold them and put them under their pillows. Didn't want the worn pjs put back in the drawer or laying on the bed or floor. They were taught at about 4 yrs old to help make their beds. They had the job of putting their pjs under the pillows.