Deportment

Her parents expected him to dress in proper attire and maintain a respectful level of deportment throughout the day. But that isn't who he is.

He's the rocker with the piercings and the slicked up hair. He's the guy with stuff in his teeth. He's the one who holds her at night, or when she cries, or when she least expects it.

So she doesn't give a damn what he wears, or doesn't wear. As long as he's there to support her, he can be whoever he wants. Even himself.