Lined hat with I-Cord - From clever, clever Phazelia, free on Ravelry. "Start with the I-cord. Then pick up stitches from the I-Cord and work the outside of the hat. (~ 75 grams of worsted weight) Then pick up stitches from the I-Cord again and work the lining. (~30 grams of fingering weight)" Use a silk, cashmere, alpaca luxury lining and you could use the scratchiest yarn around on the outside. Super-warm!