Yeah, I left a couple PM's to Jorge a couple months ago and still no answer. :/
But I believe the original jacket as well as stunt jackets to be medium weighted cowhide that had been hand distressed darker, as there are hints on certain areas that it was originally lighter brown, and the left missing arm stripe was further distressed to show almost no color at all, virtually matching the dark tan stripes. A firenze leather, if you will. Wested seems to have got the thickness and weight down, where Heron is lacking. But Heron is willing to work to change and update the patterns to make them more correct. I just don't have the time these days to constantly shoot emails to aid in the refinement. It would literally take weeks to get it right just for one jacket, and they seemed interested in getting the rest of them going for a complete Wolverine line going. But seeing as they are in their peak season for pumping out set patterns, it will have to wait til Feb/Mar timeframe to hash all this out.