I was trying to have a conversation with the dad, but it wasn't happening as all I got back was the shrugging shoulders. This isn't the first time with the shrugging shoulders either, I got the same response other times as well about forgotten clothing.
Then for sure I would just tell him that she will be turned away at the door without proper clothing and then stick to your guns and don't back down. When he pulls his face just be sure to remind him of the numerous conversations you have tried to have.