Hm, seems a bit I had a thing with sets lately, because another one was released a couple of days ago: Black Forest Hat and Cowl Set.
The set is knit in oh-so-soft HiKoo by Skacel Llamor (DK weight in 100% baby llama) and it uses the illusion knitting technique. The pattern is worked using one colour at a time and the clever use of knit and purl stitches creates a hidden pattern of diagonal lines, which changes the look of the knit depending on the viewer's perspective.
Both items are worked in the round from the bottom up. The hat has an extra long, foldable brim.
The pattern is included in Knitscene Winter 2018, available from the Interweave website, here.