You’ll need a pattern for making a cardigan, ideally knitted, but a crochet one works as well.

You’ll create the top half only.
Then add a base using the stitches found in TheCrochetCrowd Hugs & Kisses blanket.

This is a free adaptation to create a matching cardigan.

Very simple to do.

Intermediate crocheting, basic knitting.

Gauge not essential here, as you’ll follow your knitting pattern gauge & hook size & specific yarn weight.

Basic pattern included on the photo, PDF available to download with photos etc