I guess my jumpsuit was correct this entire time. Back in '99 when I ordered my jumpsuit, I purposely ordered a light blue ESB one even though I knew I was building an ROTJ suit. I just liked the color better. Now, over the years and through the weathering, it actually appears much like those pics I posted earlier in this thread......kinda grayish-bluish, with some of each showing through. Check out recent pics in this thread: http://www.thedentedhelmet.com/showthread.php?t=17580
That is a light blue jumpsuit. See it in natural sunlight. Now it looks much like the M.O.M. jumpsuit! 
My weathering I did years ago was just mix up a spraybottle of some water, gray and black acrylic paints, woodchips and dirt from the lawn. I didn't spray it on, I dumped a little at a time on an old rag and rubbed that rag on the jumpsuit, concentrating on the seams and other areas where weathering looks good. Then, I let it air dry a couple days.