I know, that's the way that Katarra made them, with just the extra stitch line. On the pre-pro pictures (my costume), the vest looks slightly different from ROTJ. There's more quilting lines down the sleeve on the ROTJ version, for instance. The pre-pro version looks like it's got piping, not just the seam line. On the tutorial, I used some fabric for ESB, but I wasn't sure if the other versions actually had the piping or just the seam lines.
I've seen more than a few scratch jumpsuits and vests that look like they've been copied off Katarra designs, when those do have inaccuracies (that have been discussed before).
I don't have the Fett reference CD, so I'm really not sure about the vest shoulder details for ESB or ROTJ. I don't trust MOM shots, either, not after what I saw when I visited.
I've seen more than a few scratch jumpsuits and vests that look like they've been copied off Katarra designs, when those do have inaccuracies (that have been discussed before).
I don't have the Fett reference CD, so I'm really not sure about the vest shoulder details for ESB or ROTJ. I don't trust MOM shots, either, not after what I saw when I visited.