This crochet boxy jacket uses a mis of simple crochet stitches and weave.
You start with a base of filet mesh, then work on top of this. Firstly with applied crochet, then you make lengths of chain that you weave through.
An interesting project, which does not use any complicated crochet stitches.
There are 5 grouped sizes on the pattern, ranging from a  to fit 28" to 62" chest.
 
I have used Rowan Tweed Haze on this project in 3 different shades.
 
The pattern PDF will be emailed to you.