I knitted size S and wear a size 12. The pattern size says it fits 8-10 for
85cm bust, but as this yarn is quite stretchy the size fits me perfectly. If in doubt make a size smaller than usual. I cannot crochet and the pattern calls for a crab stitch crochet edge around the neckline. There are instructions how to do this in the pattern book, but I found You Tube very helpful in this regard.