CBI, the Bronson B-10 I have is labeled a size 40 and I believe that is their medium. As compared to the BR RW I have also a 40, is a little bit more trim than the Bronson. I don't have other Bronson items. Also, you are right about the sizing of other clothing here in China. Much of the clothing I have bought here is either xl or xxl and I am about 5' 10" (and shrinking), weight is 165#;I have multiple cloth GW's in the cue from a very long time ago. I have not kept track of any sort of timeline.
The Bronson shirt and USN sweatshirt arrived today from China via Amazon. Really excellent quality for the price BUT beware of sizing, its NOT what is listed on their sizing charts. Stuff is small (even XXL) but will work well UNDER my A-2's. A great buy provided it fits, return to China - too expensive. Again, really excellent styling, workmanship and materials.
Don