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We’ve all agreed that Aziraphale dresses to broadcast a friendly appearance. But I’m here to argue that’s only a secondary reason for the colors he chooses for his outfits.

The more I look at Aziraphale’s outfits, the more I just see the deuteranopia visual spectrum. I’m not saying whether or not Crowley actually is colorblind, but I am definitely saying that Aziraphale knows snakes to be dichromatic, and dresses specifically so that he knows his outfits appear the same to him as they do to Crowley. Crowley’s eyes are anatomically those of a snake, so that’s a logical conclusion for Aziraphale to make.