Why Does Captain America's Look Keep Changing?

Chris Evans is now synonymous with Captain America, and he's quite happy with how Marvel has approached his character's changing look over the years.
Fans got their first look at a long-haired and bearded Captain Americain the first trailer for Avengers: Infinity War, but this isn't the first time his look has changed. Evans explained the process of changing his look to fans at ACE Comic Con.
"Yeah yeah, I had a beard, they gave me the beard! I was so happy about that," Evans said.