It’s the Great Pumpkin Quiz, Charlie Brown! by RobinJRichards

Question 4

Snoopy as we know dresses as a WWI flying ace. What color was his flight cap?

(Light) Green [In other programs and the color strips, it is brown. See the TV scenes here:] (edited at 10:29 am, October 20, 2017 (EDT))

Original Answer: (Light) Green