Once we began walking, Ben got a little nervous, though, and kept asking me to assure him that it was indeed pajama day- the obvious embarassment he would face, given some mistake on my part, beginning to concern him. 
I held him for a minute, promised that I'd go back home and get his regular clothes if I needed to, but first I asked him to be brave, hold his head up, it is "pajama day" and who cares about all of the party poopers who didn't want to participate- so he and I, and his little brother Seth, marched into the school, and to his class, where we found all of his seven year-old buddies, and the teacher, all decked out in sleepwear, just like him. 

Whew!