User blog comment:Roads/A Cookie to Whoever Can Tell Me Where the Idea For Santa's Colors Came From!/@comment-3234158-20111209015654

Hold on...
 * google google goodle* Okay got it. :D

Back in the 14th Century, churches preformed "Miracle Plays" to educate the illiterate public on the Christian religion and stories of the Bible. A specific play that told the story of Adam and Eve was usually shown on December 24th. Unfortunately the closest thing most places could get in the dead of winter to the Garden of Eden's apple tree was a pine tree with apples hung on it. Using a pine became a sort of tradition with churches and they took them out for Christmas every year. Eventually people started setting these up in their own homes, starting the tradition of a Christmas tree and the Christmas colors red and green, representing a red apple on a green pine branch.

I didn't find this anywhere, but I'm guessing that the white part came from snow, plus it just looks good with red and green.

Eventually Christmas started becoming more secular and Santa Claus was invented. He and his elves adopted the traditional colors so they looked more "Christmas-y", as those colors were already in everyone's mind.

Did I get it? :D?