For the ribbing I used 3.25 mm needles. For the main part 3.75 mm.
Hope I will have enough yarn, as I only bought 3 skeins. The price is a bit over the top. I saved up yarnmoney, made a trip to Loop in London, and spend it there on this delicious yarn.
5/1/15: it has been laying there long enough without any attention; so picked up this project again!

Sept 09 2015: A happy day! My knitting on this cardi is finished. Loved the knitting. Now blocking, sewing up and finding buttons!
It is very fine in this silk blend, so it probably won’t be for this winter to wear.
55 g yarn leftover