The Aviva top pattern includes instructions only for the top, you can buy the Aviva dress pattern if you want instructions on both the top and dress.
The Aviva top is a made to measure and size inclusive pattern, this means you measure yourself and then follow the pattern instructions.
The pattern contains a detailed sizing guide with pictures showing where you need to measure.
The pattern is intermediate level; however, I think it is also suitable for advanced beginners as I have provided detailed steps, photos throughout and stitch graphs for visual learners.
You will need any type of 4ply (fingering weight) cotton yarn and a 3.5mm crochet hook. You can use other fibers such as combined cottons, bamboo and linen, but I do not suggest any wools or acrylics.
I used roughly 750m of yarn for the size XS (UK 6).