I chained 220 with a hook (I always, always use a hook two sizes up for a foundation chain when I& making a scarf - it stops that annoying curve) and then, using a hook, simply worked half trebles (half doubles US) in the back loops.
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cabled vest/cowl - *Inspiration* this one is knit but you could easily crochet this so pull out your favorite scarf pattern and get to crocheting. You may need to adjust the width of the scarf. Once your scarf is long enough, wrap it around yourse.