As mentioned earlier, the famous JW Anderson cardigan is made via knitting technique as per its tutorial below

There are a lot of tutorials that you can find on the internet but these are the ones that I find most helpful.

1. Tutorial by Brunaticality

2. Tutorial by CROCHET BY BEV

But I often referred to Tutorial 1 video when making my cardigan. Tutorial 2 however helped me with variation of pattern designs for each coloured patches.