2 strands of merino with one strand of cashmere on 3.5mm needles gave me gauge.
Extra length to sleeves with a 1 x 1 rib finish so they can be pushed up and stay up.
Extra length to body with wider garter band on the bottom as the original rolled too much and would not sit flat.
First stitch of each row slipped with yarn in front to give a nicer edge to garter bands.
Finished cardigan weight 111 grams.
10.41 grams darker red left, all of merino used.
First 2 pics colours correct