Any yarn and corresponding hook size can be used.

I used DK yarn and 4mm, 5mm and 6mm hooks for the example pictured.

Cardigan pictured will fit up to approx UK size 26, but can be made in any size. I used around 10 x 100g balls for the cardigan pictured. I recommend allocating one full 100g ball for your ribbed edging.

This pattern is comprised of 2 pdf files.

One is for the African Flower granny square, as a separate item, and the other is for the cardigan itself, incorporating the squares.