Huffington Post:

Iran isn't exactly known to the Western world as a hotbed of inspiring trends in fashion. Under Islamic law, women must dress modestly in loose-fitting clothing that doesn't draw attention to their figures, with a hijab at least partially covering their hair. Dark colors are encouraged so as not to arouse men (who are apparently wired like bees). Nail polish, sandals and leggings have also been banned by police, who have a long history of arresting women for their sartorial offenses. But there are signs that could all be changing:

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