Any pattern for a knitted top can be altered to a V-necked top with a few simple techniques. Design the pattern yourself or take an existing pattern and change the neckline instructions. Shaping the V-neck is done with decreases. How deep you want the V in the neckline is up to you and is reflected in the spacing of the decreases and the number of decreases. The decreases should be evenly spaced and the same number of decreases should be done on each side of the V-neck to ensure an even, tidy neckline.
Decide how deep and how far apart you want the V-neck. Based on your row gauge, decide how deep you want the neckline. Use the stitch gauge when plotting out how far apart you want the V-neck. For example, if your row gauge is six rows to the inch and your stitch gauge is four stitches to the inch, to make the neckline one inch apart and one inch long, you will decrease four stitches in six rows.
Graph the decreases using knitter's graph paper. Each block on the graph paper represents one stitch. Generally, V-necks are done in a series of decreases, with one stitch decreased on each edge of the V-neck. The more decreases you add, the wider apart the v-neck becomes. Plot your decreases one or two stitches in from the edge. This will ensure a neat neckline. Do your decreases on the right side rows only and work all stitches in pattern on the wrong side of the work.
Work the neckline from the chart you created. The neckline will start at the beginning of the V-neck and end when you are ready to cast off all stitches.
Add an edging to the V-neck. Pick up stitches and work in a decorative stitch pattern or ribbing. Alternately, you can add a single crochet to a neckline done in stockinet stitch to keep the piece from rolling at the edges.