The pattern for this sweater is from the book Knitting with Icelandic Wool. It is called Æði.
Instead of the yarn in the pattern, I use Sirri 3-ply Blue C16, White and Light Gray.
I am knitting size XS on needles 8 mm, since it has 109 stitches, and I know this should fit me (Size M) in Sirri yarn. And then size L for the length of sleeves and body.