Very easy vintage style skaters hat, yardage depends on the type of wool used.

Materials
Chunky Yarn in your choice of colour
7mm Straight Needles And 5mm Double Pointed Needles

Pattern : Seed Stitch
Seed stitch is , Knit, Purl, Knit, Purl (cont across row), on row 1, and on row 2 you Purl the Knit stitches and Knit the Purl Stitches
(instructions and image here - http://www.dummies.com/how-to/content/how-to-knit-the-see... )