If it were me, my first port of call would be Helikon Tex. They've been making a version of the m65 jacket for a while. I've never owned it, but have a couple of their other polycotton smocks (the Pilgrim Anorak and SAS Smock) and they're both excellent. I appreciate that's not as helpful an answer as you might like. But I've got a lot of Helikon Tex kit and have always been very impressed with the quality. I've no doubt that their M65 Jacket will be no exception to this rule.