A long time ago , Santa Claus hadn’t had a fixed image . However , he might put on a green or brown coat . The green means that it is a grace of nature . In addition , he might have a beard or not . Haddon Sundblom , an artist , designed a picture about Xmas for coke advertisement in 1931 . In the picture , you can see an old man wear a coat in red and has a long white beard . The interesting design was popular with the public . From that time , Santa everybody know just like that . 有什麼需要修改的嗎？