Just for the record Hitler did not earn his country’s highest honor in WW1.
He earned the Iron Cross Second Class.
Had he earned an Iron Cross First Class he would have worn it at the collar as was the prescribed manner.
The Iron Cross Second Class was worn on the left breast pocket.
The cross was either worn that way(as pictures clearly show this to be the case with Hitler) or a soldier would wear the Iron Cross Second Class ribbon in the second breast pocket of the uniform tunic.
I stand corrected.