Materials: 2 skeins black Rubin from Spar Kjøp [weight: DK / 8 ply (11 wpi)]
+ 10x2 threads of purple baby wool, á ca. 2 m
5 dpn US 2½ / 3.0 mm
1 cable needle if needed
Note: The colours are a bit off in these pictures. The closest to true colours is the last picture, the one of the wrong side of the work.
Since I'm writing down the pattern almost a year after I made the hat, I don't have a gauge for you. I tend to knit pretty tight though, and if you do as well then you might want to consider going up one size on the needles. Either that, or throw in another 9 stitches + 2 stitches cable. I used double threads for the cables, since the baby wool is much thinner than Rubin.
Cast on 110 loose stitches, join the ends and start a *K1, P1* ribbing. After 8-10 cm start pattern.
Knit pattern as follows:
Row 1: *K9 black, K2 purple* Repeat *-* all the round. When you're finished with one set of K2 purple, leave the (double) thread hanging and K9 black. When the second K2 purple comes, start on a new thread. Do this for all the cables, 10 cables in total.
Row 2: *K8 black, slip first stitch to cable needle [cn] , hold to back, K2 purple, K1 from cb*. Repeat *-*. (If you want to twist the cables the other way, do this: *K9, slip first two stitches to cn, hold to front, K1, K2 from cn*.)
Row 3 and all odd numbered rows: As row 1.
Row 4 and all even numbered rows: As row 2.
Continue this pattern until desired length before decreasing, while making sure that the purple threads aren't getting tangled up. Start decreasing like this:
Odd numbered row: *knit until there are two black stitches left before a cable, knit those two stitches together [k2tog], K2 purple*. Repeat *-*.
Even numbered row: *K7 black, slip first stitch to cn, hold to back, K2 purple, K1 from cn*. Repeat *-*.
Continue decreasing on every odd numbered row until there's only one black stitch left between the purple cables. Now, here's where I don't actually remember what I did, so this is just a suggestion:
Knit one round of all black stitches, then a round of k2tog, still all black. Weave the thread through all the stitches and pull tight, closing the gap. Weave in all the ends. This can be a bit tricky with the purple threads, as you don't want them to show through the black stitches and you don't want to make the cables too bulky. The wrong side should look almost as neat as the right side, like this:
You probably want to make a pompom to cover the top as it might not be that pretty, with all the cable threads. Alternatively you could crochet a flower or something and attach to the top.
If you have any questions about this design, just ask in the comments. I might make a new hat like this, and then I'll make sure to write down the pattern immediately, so I don't forget anything.