It actually went out of style because the soldiers had to shave their faces for the gas masks to work properly.
Most Helpful Girl
I'm going to go with all those people's lives
Most Helpful Guy
Bearing in mind, we've come full circle, and young men these days are sporting the kinds of beards that elderly men might have worn in the 1880s, it's probably just a few more years before all of this comes back into fashion...