Thread:Maddog98/@comment-4842541-20150606031801/@comment-4842541-20150707165852

Pretty much exactly the point. Besides, considering that Shadow raised Jack's ancestor and that Jack reminds Shadow of that ancestor, it's most likely Shadow would treat Jack well.

On top of that, Jack's kind of a dork in the first place. He probably dresses like that because he likes it. There's also the fact that most of the time he's wearing his black robe, so you can say he only really becomes formal when he starts to do sword play.