Gauge: 25/26 sts32/33 rows in 10cm10cm
All dimensions in cm.
Circular needle 5mm.
Greennary yarn: Silk14% Cotton51% Rayon29% Polyester6% (290m/100g)
The most important part of the dress is the top one. It is tight around your breast. The lower part is just hanging down. So you should not worry that it is big/wide. It must be freely.
I bought Greennary yarn here: