This cardigan is not hard to make .
The stitch that I use is : SINGLE CROCHET, FRONT POST TRIPLE CROCHET, DOUBLE CROCHET and BAC LOOPS SLIP STITCH.
The yarn is Alize Cotton Gold Plus and the crochet nr. 5 mm, but you can use any tipe of yarn you want who works with the crochet nr. 5 mm.