If I understand the question and what you mean, you're asking how does the belt fabric go: From the top A pillar into the top of the hook, out the bottom down to the mount. "Top" of the hook as in "This side up when buckling" as my old original Kangol scan you found shows
Think of the hook as a J with the belt webbing the serif on the top of the J. The top A pillar mount is the left side of the serif. This is what you were wondering, right? It wouldn't be as comfortable (Nevermind the belt would probably become undone in an accident) if the J were pulled from the other way around.