Maria

I participated in a nativity play at church last night where I played one of the wise men, not wise guys, wise men. As we were waiting to go up stage, suddenly I had this thought, for all the Maria I have seen, in nativity plays or painting or sculptures or movies, she always wears either blue (dark blue, light blue, pastel) or white. I have never seen any other color on her. Why that is? Then I tried to picture Maria in red, yellow, green, and they just don't work on her. How come? Does that has anything to do with that blue sky and white cloud make us feel a sense of clean, and that is the image we want to impose on the mother of Jesus?