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Vampires wearing black makes no sense. Black absorbs heat, which would make any accidental contact with sunlight even worse. Consider: vampires wearing white, maybe even reflective, clothing, carrying umbrellas meant to block sunlight, big sunhats (that have little flowers or something on them because pretty much all sunhats have little flowers on them). Ideally, they wouldn’t be out at all when the sun comes up. But the extra reflectivity could mean the difference between life and death for a vampire caught out at dawn.