Well, I have to admit I didn't quite realize they were pjs at first, but in the context of the other thread about parent dress codes, what's good for the goose is good for the gander ... or rather what's good for the rich goose is what's good for the middle-class/poor goose ... jammies are jammies; I hereby declare this a fail by those rules!
Imagine a school, or any institution, saying, you can't wear yoga pants ... unless they are Lululemon, then it's fashionable so okay ...