MissX you are missing the point. Islamically showing the thighs is considered "intimate" nakedness. Your concept of clothing is reaching a bit as even in warmer climates nakedness is not permitted as a moral standard, not out of necessity.

Walking in downtown New York bare breast is illegal, even in summer when it is upward of 35 degress. I am sure in this weather one could walk naked without the necessity of clothing but that doesnt justify it does it?

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"Diplomacy is the art of saying 'Nice doggie' until you can find a rock - Will Rogers"