After some very, very thorough research by some of the Fett sticklers here along with an exhaustive search for it's origin, we feel that the most accurate vest fabric currently available has been located. The color is a very "warm" gray (almost white) and the fabric composition (weave, texture) is extremely close to that of the MoM RotJ vest. Look at the pics below and judge for yourself.
The manufacturer of this material has a somewhat limited supply of it. They also only make this material about once a year, so when they run out of this batch, it won't be available again until 2004.
This color is for the RotJ vests. The ESB vests are slightly darker, and we are not 100% positive how well it will accept dye due to the very small test sample that was provided. A similar material that was located did accept dye, but we do not want to promise that this one will. Due to the limited supply of this material and the fact that the manufacturer will not do small sales of it (they are a wholesaler who deals in bulk), we need to do a big order of it. Therefore if you are interested in getting in on this possible one-time only deal, please post below so we can get an exact amount needed. The cost is $16.00/yd. I would recommend no less than 2 yds. for a vest, although I personally am going to get 2-1/2 just to be on the safe side (something I recommend). That would make it $40 + S&H. A NON-OFFICIAL delivery date would be about a month from the date they receive payment. Only post IF you can make this monetary commitment now as we want to order it a.s.a.p. Once we know the total amount to order, we will request payments.
A side note: This is also the same fabric used on the backs of Fett's gloves (the white panels).