In X-Men: First Class, Charles wears a lot of blue colours in his sweaters, dress shirts, and his jacket. They are also present in the X-Men suit he wears at the end of the movie. Blue often symbolises calm, peace, and serenity, which plays beautifully into what he tells Erik when teaching him to harness the full potential of his powers—to find the point between rage and serenity. In the first movie, Charles is a source of comfort, peace, serenity and knowledge.
In X-Men: Days Of Future Past, he wears a lot of red and reddish-brown tones, from his robe to his pants and dress shirts. Red is seen as a much more passionate, angry colour, and it goes perfectly with the emotions he portrays in the first half of the film. He is angry at the world, at Erik and at himself. He lashes out and, without his powers, has to rely on physically intervening in situations, like placing himself between Erik's gun and Raven. The only time we see him wear blue is on the plane when he's playing chess with Erik, like he so often did during the events of FC. But as the movie ends, after he spoke to his future self and found his way again, he wears a blue sweater for the climax of the movie, much like he is trying to find his way back to himself.
In X-Men: Apocalypse, Charles wears purples and lilacs a lot, which is a mixture of blue and red. It seems as if Charles realised that he cannot go back to the way he was before the events of FC and DOFP, that there is still a lot of anger and hurt inside of him about everything that happened. But at the same time, he can reconcile these feelings and these darker sides of himself he has experienced, with his sense of self, with the calm, serene, nurturing and wise man he is. He may not be able to be who he was in FC, but he also moved past who he was in DOFP, and while the memories of these two people still exist in him, he can reconcile these parts of himself with each other, the red and the blue, to be purple, a colour symbolising wisdom and ambition. In this essay, I will--
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