Fibonacci Pea Cap

This is David's Christmas present. Fortunately, I don't believe he knows I have a blog.

Yarn: 1 50-g skein worsted weight (19-20 sts/in) wool, approx. 100 yards; partial skein contrasting yarn, same weight, less than 50 yards.
The yarn I used is Austermann Inka alpaca/wool.
Needles size 6 and 7. You can do this with two circular needles, or a set of four dp needles, or start with a short (16") circular and move to dps. As you wish.
Tapestry needle for weaving in ends.

Size: medium (large) size adult head.
Gauge: roughly 19 or 20 sts/4" in stockinette stitch. Gauge is not critical, as it stretches.

Using main color (MC) and smaller needles, CO 96 (100) sts using long tail or half hitch method.
Place end of row marker and join, knit 2x2 twisted rib for 13 rows: *K2 through back loop, P2, repeat from *.
Knit 1 row around. This is your fold edge. The ribbing will fold here.
Knit next ten rows in twisted rib, but staggered from the first 13 rows: P2, K2tbl, repeat from *.
Change to larger needles.
Knit next 3 rows (stockinette).
Change to contrast color (CC). Knit 8 rows.
Follow this color sequence for the Fibonnaci pattern:
MC 5 rows, CC 3 rows, MC 2 rows, CC 1 row, MC 2 rows, CC 3 rows, MC 5 rows, CC 8 rows, MC to end.
AT THE SAME TIME, when work measures 5" from fold edge, place markers every 24 (25) sts, then begin decreases:
Row 1: Decrease row: *K2tog, K to within 2 sts of next marker, SSK, slip marker, rep from * to end.
Row 2: K 1 row around.
Repeat these two rows around until there are 32 sts (8 sts between each marker).
Now, decrease every row along the four lines of decrease until there are 8 sts left on needle(s).
Cut yarn, leaving a tail.
Weave in ends. Lightly steam the lines of decrease.