My daughter wanted the perfect slouchy. It is a very simple pattern, but seems to be a success as she hardly takes it off! You can use a heavy worsted to Aran weight single or combine two fingering to sport weights. It's a very forgiving pattern but generally the lighter weight the yarn the slouchier your hat will be.
General knitting skills.
small (medium, large)
20 (22, 24)" head
2 skeins Jade Sapphire Mongolian Cashmere 4 ply used double (100% cashmere, 55g/200yds); sample knit in color #57 deep plum, or
120 (130, 150) yards soft, worsted to Aran weight yarn that gets gauge. Double yardage to use fingering to sport weight held double
US 6 circ and US 10 circ long enough to use magic loop method, or US 6 and US 10 dpns
Extra needle for 3-needle BO
Change needle size if necessary to obtain correct gauge.
16 sts = 4" (row gauge not important) in stitch pattern with US 10 needles. This is measured unstretched. Swatch stretches easily to 12 sts = 4".