The vest you are going to crochet consists of 1 back panel and 2 front panels. You crochet these separately and then seam them together at the shoulders and sides.

The body is worked in the yarn over slip stitch in the back loop. For the finishing around the ribbing, you will also use single crochets.

Further on in this pattern, you will find photo tutorials of these stitches. Or watch the video tutorials via the link in pattern.