Looks from Ohne Titel's 2010 Spring show.
Lookin' a bit like some past seasons of Rodarte, no?
Ultimately Kate and Laura should take this as a sort of sincerest form of flattery. Fashion is a universe of ideas where nothing exists in a vacuum and everything is up for grabs and refits and reuse. There's nothing wrong with some borrowing. I just can't believe I haven't heard anybody raise the issue. Don't worry Sisters, I'm on it.