Pattern available in JAPANESE here.
The Ravelry pattern includes 3 PDF’s: in English, French and Icelandic

Mosi, Grýla Collection
Traditional mittens & Colors of Iceland

There are many different types of traditional mittens in Iceland that were knitted with very fine and soft handspun Icelandic yarns. The Mosi Mittens, with their lovely colors, are a fresh take on traditional stranded mittens. The little motifs on a green background ensure that the fabric is warm and remind of the thick and spongy moss (mosi in Icelandic) that covers Old Icelandic lava fields. The mittens are worked in the round from the bottom up with an afterthought thumb and the tip is shaped with centred double decreases.

You can achieve more sizes by changing needle size (2,25 to 3,25 mm / US 1 to 3 are suitable sizes) and adjust length by adding or removing rnds above and under the rose motif (rnds 53-65).

The pattern includes step by step pictorial tutorials for special techniques.

Pattern & Kit on icelandicknitter.com
Patron & Kit sur tricoteuse-islande.fr
Uppskrift & Garn prjonakerling.com
Pattern available in Japanese here