What do you think of when you hear the word pajamas? Most likely you think of bedtime, not school. Pajamas (also called pj's or jammies) are for sleeping. They are so comfortable that some people laze around the house in them. Others wear them to town! Some teachers have "Pajama Days" for special rewards.
Look in the dictionary and find "pajamas." It might say "a loose, usually two-piece lightweight suit designed especially for sleeping." To most people, the word pajamas means loose fitting pants and a top. In broader terms, there are other kinds of pajamas. One-piece footie pajamas are popular for babies. Children and even adults can wear footie pjs. Although, most kids would not wear them to school on Pajama Day.