Oh this one didn't start as a debate. She made the initial post sound like a legitimate question (well, as legitimate as "Would it be ok to wear pjs to dinner in the MDR?" can be...) but the moment she got a 100% NO response (and 100% is RARE on this board) she was all "Well, they are comfortable. And we are going to do it anyway. And I'd like to see them stop us." So then it turned into a debate.
Edit to add: The only time I would not totally fault someone for wearing pjs to a meal (well, I'd snicker and judge their lack of thinking/planning) would be debarkation breakfast if they forgot to put clothes out to wear home before putting their suitcases in the hall. At that point we should just be glad they DO wear pjs...