Mindful, what is the explanation given for the preference of black? I could not get the theory if it out of my daughters.
In Gemora, black was for those who wanted to go sin and would go to a different city. True, there were inappropriate colors (the Rav who assaulted an inappropriately dressed lady at the shuk who turned out to be non-Jewish and he gladly paid the fine). And it is cultural (I think an appropriate present for an Israeli lady is linen clothes, while for Babylonian – colorful).
But what is specific explanation for black v. any other reasonable colors?