Darn Good Ripple Slouch Hat

Using I9/5.5mm hook; Ch 80, slst to form a ring. 

Row 1: Using h/8 5mm hook; Ch 3 (counts as dc + ch 1), dc into the same st as join, ch1. (skip the next chain, dc into the following ch, ch1) x3. Skip the next ch, Mod-dc3tog, ch1. (Skip the next ch, dc into following ch, ch1) x3. Skip the next ch. [ Work (dc, ch1) 3x into next ch. (Skip the next ch, dc into following ch, ch1) x3. Skip the next ch, Mod-dc3tog, ch1. (Skip the next ch, dc into the following ch, ch1) x3. Skip the next ch. ] x3. Dc into the same st as join, ch1, slst to join. <80 sts>

Row 2-11 (13): Ch 3, dc into same st as join, ch1. (Skip next ch, dc into following dc, ch1) 3x. Skip the next stitch, Mod-dc3tog, ch1. (Skip the next st, dc into the following dc, ch1) 3x. Skip the next st. [ Work (dc, ch1) 3x into next dc. (Skip the next st, dc into following dc, ch1) x3. Skip the next st, Mod-dc3tog, ch1. (Skip the next st, dc into following dc, ch1) x3. Skip the next st. ] 3x. Dc into the same st as join, ch1, slst to join. <80 sts>