Perhaps a rather unsavoury topic, but nevertheless: I was looking at WW2 German shirts and noticed that some, specifically the 'brown shirts' had turnback double cuffs. More interesting was that they had an attached button. I can't find a good picture of it right now, unfortunately. Were these kinds of shirts common back then? They seem like a good idea for casual shirts where you don't want to wear cufflinks, but prefer the double cuff.