I saw a you tube video that said the proper way to wear your pack was. Put you pack on then your jersey. Let the front of your jersey hang over the pack. And put the back of jersey behind the pack. Just curious.
When playing a tournament, I'll tuck it in all around and then pull the front out just enough to cover my pack's belt. Though there have been a few times when I left it all untucked and the refs didn't say anything about it.