Double Crochet Decreases, or DC2tog (double crochet two together) as it’s written in patterns, is a common technique used in sweater making where you need to shape your fabric in order to create a piece that flatters and fits your body. This technique might sound intimidating, but it’s easy to master. All you need to do is turn two crochet stitches into a single stitch! Watch to learn how easy that can be.