About Ribbing
Whether it is used to create a snug fit or just to mix up the texture, ribbing is a welcome addition to many knits. Most commonly, you will see ribbing used as edging on garments. The proper type, when applied to a knitted item, can help it to wear better over time in the areas that take the most abuse (such as the leg of a sock, waistband of a sweater, hatbands or necklines).
K1P1 and K2P2 ribbing are the most commonly used when the knitter wishes to add some elasticity to an edge. The alternating stitches nestle into one another, causing the fabric to gather.
The greater the number of knits and purls in your alternations, the less snug the ribbing will be. A common trick is to use a smaller needle size when completing the ribbing on a waist, wrist or neck band and then switch to larger needles for the body of the sweater.
When working ribbing in the round, you will need a number of stitches that is divisible evenly by your ribbing sequence. For instance, K2P2 would not fit evenly into 30 stitches. You would need to increase to 32 or decrease to 28 stitches. Otherwise, you would have 4 knits in a row. When working back and forth, just make sure you are knitting and purling the appropriate stitches. If the last row you worked ended with purling, you will begin the next row with knitting. If it ended with knitting, you will begin with purling.
The sampler shown above contains, from the top: K4P4 rib, K3P3 rib, K2P4 rib, and K1P1 rib. You can use blocking to loosen the ribbing, as was done to the sampler swatch.
You can create rib with infinite combinations of knit and purl. Make the ribs as wide or as narrow as you like. Experiment and have fun!


Here is an example of corrugated ribbing:
Knit your first stitch, then bring the second color of yarn forward for your purl stitch(es).
Return the second color of yarn to the back of the work and pick up the first color again to return to knit stitches.
The ribbing is created by alternating 2 knit stitches with 2 purl stitches. If you are knitting in the round, you will just continue in this manner until your section of ribbing is as long as you need it to be. If you are knitting flat, you will need to knit your purl stitches and purl your knit stitches on the wrong side of the piece.
Over an even number of stitches, twisted rib can be completed as follows:



