I totally agree. I am also in the "it's not tackle twill!" camp. I still have not traced down the source for where this idea originated. It just seems to be accepted dogma. It's wrong. Until an official source turns up to tell us what it really was, we are left to guess. And I am also guessing a poly blend of some kind. Maybe even a nylon blend. Whatever it was, they almost certainly used the same material on the snowspeeder pilot jackets.I am pretty sure the original vests were a cotton/poly blend. NOT tackle twill or PolyPro twill.