The Solaris top is a made to measure and size inclusive design, this means you measure yourself and then follow the pattern instructions.
The pattern is an advanced beginner level that uses US terminology. The pattern has detailed steps with pictures throughout and stitch graphs for all stitch patterns. You will need any type of 4ply fingering weight yarn in cotton or mixed cotton blends and a 3mm crochet hook. I used roughly 650m for the size small (UK 8).