I have a charity knitting book which has a pattern for a man's K2 P2 scarf. It is worked with 2 strands of DK, 2 x 100 gram balls and 42 stitches, 7.00 ml needles. Length is approx. 140 cm (4 feet 8 inches) but you are asked to knit until the yarn runs out. Another 100 gram ball is used to knit a matching K2 P2 beanie with an 8 cm (approx. 3 inch) turnback. Number of stitches is 70, but I generally use 74 or 78 for a man, especially if the yarn is a bit thin.
Work in K2 P2 until 26 cm (10.5 inches) in length. To decrease for the crown, knit all of the knit stitches together, then work 3 rows. Then purl all of the purl stitches together, then work 3 rows. Next row is K1, K2 tog right across the row (18 stitches remain if working with 70). Then P2 tog right across the 10th row. Pull yarn through remaining stitches.