Thanks guys. I tend to go with a L in IH jackets. My 526PJ, 2526PJ, UHFs are all large. I do go down to a medium in most IH shirts, though. Based on SJ's sizing, it looks like a large is for me. I have a size 40" chest and I tend order jackets in the 43-44" P2P range in order to be able to button them.
I do realize that even if I were to get an order in next week, I'd be waiting for like 9 months. I'm willing to wait! This jacket looks amazing!