Checked my gauge with 4mm needles and it was at 20sts = 10cm, so I switched to 3.5 mm and now have 24 sts = 10cm. The pattern is very straightforward and compact and the wool is really nice to knit with.

September 2018: Wanted it shorter than the original so for the shape sides section repeated the inc round 16 more times (17 in total) instead of 26 more times (27 in total).
Steam blocked.
Love it.