One mashine washing of my Bronson B-15A at 30 degrees was enough for the jacket to have an excellent used look and (did not shrink).
Perhaps you are right, you should wear it and then wash it again. And we still have no weather for these jackets ...- 12 C.Nice - looks definitely more used than mine. Especially around the pockets. But as I said, I’ll just have to wear it. Just like back in the days... Hope that the colder days are not over yet.