My body was draped head to toe in black, but I still felt naked. I have spent years living and working in Jeddah, Saudi Arabia, yet now, for the first time, I was alone on a secluded street near the Red Sea, unescorted in public after sundown. Across the road, cab drivers in loose white robes squatted against a concrete wall, smoking cigarettes and eyeing me with open interest. I set my face with practiced indifference as I glanced quickly up and down the street. Then I saw them: two dozen women power walking, their limbs synchronized in the…