Levi’s didn’t just invent the jean, but also the jean jacket. Back in 1936 the label debuted the 506XX, known as the Type-I jacket. With its pleated front, slim fit, back cinch, and singular chest pocket, it was more of a highly durable work shirt than proper jacket.

That changed in 1953 when it was updated to the 507XX, aka the Type-II jacket. As point…