Overall an easy project, although sewing was a bit difficult due to fluffiness of the yarn. Made size M for an oversized fit but could easily go size down as the yarn is pretty light (my chest measurement is 87 cm).

Back:
3 cm rib = 6 rows (5 mm needles)
51 cm stocking stitch - 102 rows (7 mm needles)

Left front:
start garter stitches from the very first purl row
decrease 1 in rows 53-57-61-65-69-73-77-81-83, decrease 3 evenly in row 99 (stocking stitch rows)

Right front:
buttonholes: rows 3-19-35-51 (stocking stitch rows)

Sleeve:
10 cm rib = 26 rows
increase 1+1 in stocking stitch rows 11-25-37
72 rows in stocking stitch