The knitted texture is created by working every single crochet into the center of the stitch instead of under the top 2 loops of the stitch.
Via Tangled Happy
Stillwater Shell Stitch Crochet Headband
Crochet Twisted Knit Look Headband
Textured Crochet Headband Pattern
Crochet Cable Headband Pattern
Poppy Flower Crochet Headband Pattern
