If you are outdoors in a cold polar region during the day what will keep you warmer?

Details: The color is on the outside, the inside you can assume is a neutral gray for simplicity.

@freemo I guess the most chosen answer is not the correct one, right?
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Answer 

@xarvos Correct, the answer is white. Reason being black radiates more heat while white radiates less. White behaves like an insulator while black acts a bit like a heat sink for IR.

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