The Aya shirt is a unisex made to measure and size inclusive design, this means you take your own measurements as directed in the pattern and then follow the steps. This means it can be made for any size and age.
The top pattern is written in English only using US terminology.
The pattern is an advanced beginner level, however some beginners may find it okay as there is plenty of photos throughout to guide you.
The crochet top pattern uses roughly 800m of 8ply (light worsted or DK) weight cotton for the sample size (UK 8). You will need more for bigger sizes, you will also need a 3.5mm crochet hook.