It is entirely possible to make a sweater without ever increasing or decreasing the number of stitches. Four plain rectangles can be sewn together to make a perfectly serviceable covering for your upper body and arms. Most of us, however, prefer our garments to bear some relationship to the shape of the body underneath. Producing such garments requires a working understanding of increases and decreases. In this article, we will take an in-depth look at increases. Look for the discussion of decreases in the Spring issue.