Really like how this turned out. Very soft yarn. The stripes kept it interesting and hard to stop knitting!
Just going to change the buttons to something more subtle.

Cast on 120 st on 3mm needles.
Changed to 3,5mm needles and knitted 3x german short rows.
Increase 23 st on first row after GSR. (yo)
1 extra row of increases to 302 st.
Added 4 extra rows to the yoke.

Start decrease arm on row 26
Picked up 140 st for the button band. 11 on the bottom.