I believe the move to clean shavedness started with WW1. It about after the Army insisted on soldiers being clean shaved due to the fitting of gas masks and all-around sanitation. The idea just bumped along until the 30's when Gillette brought out their butterfly razor and accompanying disposable blade. Along came WW2 and facial hair met its Waterloo. It came to be seen at various times and places as only being worn by intellectuals, hippies, and the Mennonites/Amish. I was told back in the day it was a sign of rebellion.