This is not a full pattern, but just basic instructions. This scarf sweater is so simple - it’s just a long rectangle like a scarf, wrapped around the body and seamed in 2 places.
You can use any weight of yarn and an appropriate hook to make this, and any stitch pattern you want! For my sample, I used worsted weight yarn (Bernat Satin, less than 3 skeins to make a size Small), an H hook, and an eyelet ripple stitch pattern.
The instructions on my blog just explain briefly how to crochet the right size for yourself (a measure as you go method) and assemble the sweater from the scarf.
Updated: the instructions now include my eyelet ripple stitch pattern, with stitch diagram and written instructions :)