I tried different yarn combinations and finally decided to go for the combo Isager Merilin and Isager Bomulin. A combination of merino, linnen and cotton. So no silk, hopefully it has enough drape.

I also swatched with Isager Bomulin/Isager silk mohair and with Isager Bomulin/Isager alpaca 1 but found that both too floppy and loose.

Back and front panels: I did not work the first and last stitch as a knit stitch, but just a knit and a purl stitch.
Length back and front: 130 rows (= 44 cm).

Sleeves: Pick up 3 out of 4 sts to get 95 sts for the sleeves (4 out of 5 is not possible, and I did get gauge…).
Knit 22 rows before joining in the round.
Knit 108 rounds with decreases every other round.
Knit one round with decreases (K2tog k2, k2tog k2, …), knit 1 round on needle 2,5 mm. The sleeve is still too wide, so:

Knit another round with decreases (k2tog, k2) untiill 48 stitches in total.
Knit 5 cm of k1p1 on 2,5 mm (=15 rounds).
Increase 12 stitches untill 60 stitches.
Knit again with 3,5 mm another 10 cm in stockinette stitch.
The sleeves are so big, it’s a LOT of knitting.

Neckline
I didn’t like how the shoulders looked with the unfinished neckline, so I picked up stitches around the neck and knitted 3 rounds before bind off. The neck opening got smaller and I look the look of it a lot more.

Body
Picking up stitches below the armholes and knitting the body in the round. Making decreases below the armholes every 12 rounds (4 times). After knitting 16 cm in the round:
Adding a 3 stitch i-cord instead of let the fabric curl a lot. It still curls, but I think the icord gives it more stability.

So happy with the fit and the endresult. It is a fantastic pattern!