In Iran they wear black chadors and scarves in ninety degree (F) weather. This is because the alternative cooler summer outfits
cost a little too much in fines, prison and even flogging. The current Iranian conservative government (which wasn't actually elected) has ordered a crackdown on women who alter the required Islamic garb by wearing lighter-colored and/or shorter chadors. These corrupt the social morale (where is the social morale located, by the way?). Never mind that being shrouded in black in boiling heat corrupts the woman inside the outfit.