In a group of friends yesterday we wondered about the popularity of Hitler's signature mustache. We asked ourselves whether this style of facial hair was popular at the time and following ww2 it became unpopular because it was the choice of the terrible dictator. The other senario that we came up with was the possibility of this stylistic choice was even then a rare one. What would be the likeliest senario? Sorry for bad English and thank you for your time.