Isn't it already unnecessarily hot in there? You'd think wearing clothes over clothes would just make it worse.
Boy, was I wrong.
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They don't have to wear black, many don't. They also wear different fabrics, ones that breath more in the heat. Its also worn over regular clothing so while it may absorb heat it doesn't necessarily transfer to them since they have a buffer under neath it. As for the reason for it its to protect there modesty. Which is why the more conservative where black because it is less likely to be seen through (most likely to occur on those hot days where they where thinner materials). As for why they where it for modesty, I would surmize that it was quite beneficial at the time it was enstated. It would have reduced the probability of a man attempting to seduce a woman (since he isn't going to be able to gauge attractiveness) thus reducing the probability of infidelity on the mans part and on the wifes part as well as reducing the probability of sexual conduct that may lead to an illigitamet child (thus reducing a daughters probability of winning over a high status male to marry)(they are allowed to wear there regular clothing at home in the presence of family ie people they are not going ot have a possible sexual relationship with). It also functions as an equallizer for women. Since every womans status was/is based on looks, looks determined who got the highest status mate, by all women being covered this would negate that advantage thus making all women equal, this would mean women would not compete against each other based on there looks and men would not fight over the most attractive women ensuring some kind of harmony and that all women would be taken care of instead of the unattractive ones being abandoned for the more attractive (in theory). Here is a link that also explains some reasons: www.quora.com/How-do-Muslim-women-manage-summer-in-black-clothes2