-with two strands of C1, make starter loop and work 8 sc around loop, pull tail to tighten  (alternately, ch 2 very loose, join to form circle, work 8 sc in first ch, join with sl st to beg)
-ch 2, turn, 1 hdc in same, 2 hdc in each around (16 hdc)
-join one strand C4, ch 3, turn, *2 dc in next, 1 dc in next* around, 2 dc in last, join with sl st to beg  (24 dc)
-join C3, work with two strands through front loop only, ch 3, turn, 1 dc in next, 2 dc in next, *1 dc in next, 1 dc in next, 2 dc in next* around, join with sl st to beg  (32 dc)
-join C2, work with two strands through front loop only, ch 3, turn, 1 dc in next, 1 dc in next, 2 dc in next, *1 dc in each of next 3 sts, 2 dc in next* around, join with sl st to beg (40 dc)
-join C4, one strand through front loop only, ch 3, turn, 1 dc in each of next 3 sts, 2 dc in next, *1 dc in each of next 4 sts, 2 dc in next* around, join with sl st to beg  (48 dc)
-join C1, work with two strands through BOTH loops, ch 3, turn, 1 dc in each of next 4 sts, 2 dc in next, *1 dc in each of next 5 sts, 2 dc in next* around, join with sl st to beg (56 dc)
-join C2, work with two strands through front loop only, ch 3, turn, 1 dc in each around, join with sl st to beg
-join C3, work with ONE strand through front loop only, ch 3, turn, 1 dc in each around, join with sl st to beg
-join C4, work with ONE strand through front loop only, ch 3, turn, 1 dc in each around, join with sl st to beg
-join C1, work with two strands through BOTH loops, ch 3, turn, 1 dc in each around, join with sl st to beg
-join C3, work with ONE strand through front loop only, ch 3, turn, 1 dc in each around, join with sl st to beg
-join C2, work with two strands through front loop only, ch 3, turn, 1 dc in each around, join with sl st to beg
-join C4, work with ONE strand through front loop only, ch 3, turn, 1 dc in each around, join with sl st to beg
END

MAKE SCARF with leftover yarn
-with one strand of C2 and crochet hook J, ch 203, work 1 dc in 3rd ch from hook, 1 dc in each ch across
-join C4, work with one strand through front loop only, ch 1, turn, 1 sc in each across
-join C2, work with one strand through front loop only, ch 1, turn, 1 sc in each across
-ch 1, turn, 1 sc in each across through front loop
-join C4, work with one strand through front loop only, ch 2, turn, 1 hdc in each across
-ch 1, turn, work 1 sc in each front loop across, END
-use remaining yarn for tassels

NOTE: a tip on changing colors.  when working the last stitch of the previous color, do not pull last loop through, instead use the new color for the last pull through

You will still have
lots of Optimum DK
after making the hat.  Maybe a pair of
matching
wrist warmers?