It turns out, the Mattress Stitch works perfectly!
It turns out, picking up stitches and knitting in the round are harder to explain than they are to execute.
It turns out, after a lot of handling, Noro feels a lot softer than it does in the original hank.
It turns out, this pattern plus this yarn make a fun [and warm!] hat.
Mochi Spiral Hat
Noro Furin (colorway #11), Sz. 10 needles (6.0 mm)
It turns out, I only used one skein to make this hat.
It turns out, casting on for a matching scarf is pretty irresistible, even if said scarf is going to be somewhat short and skinny.