Yarn: Trendsetter TONALITA. It is a 32% wool, 48% acrylic yarn. Soft and shiny. I bought it at Village Yarns' (sorry no website) year-end sale for $3.00, and didn't even use the whole ball to make this (maybe 3/4 of it or a little more). What a deal!
Pattern: My own. I knit alternating bands of stockinette and reverse stockinette, shorter rows at the bottom and then increasing once past the neck. Then reversed shaping on the other side and did a three needle bind off with the cast-on edge (just picked the stitches back up). It is nice and stretchy, stays in place, and covers my ears completely.