When binding off a cabled project, your bound off edge may look wavy and flare out – this happens because the stitches are compressed within the cables, but expand at the edge of the fabric, making it wider than the rest of your work.
The Binding Off Over Cabled Fabrics technique is very helpful in keeping the bound off edges of heavily cabled fabrics from becoming wavy or flared. This technique has you reduce your total stitch count at the same time as you're binding off, for a smoother, more uniform edge.
Written Steps
To prevent edge flaring when binding off over cabling, bind off by working 2 stitches together out of every 4 stitches over cables. First, if needed, place a removable marker after the last stitch of the cabled section that is to be bound off, so that you do not lose count while decreasing and binding off at the same time. If the cables cover the whole width of the piece, you will work this technique over the entire bind off.
Then, work 1 stitch, *k2tog (or p2tog), pass previous stitch on R needle over stitch just worked, [work 1 stitch, pass previous stitch on R needle over stitch just worked] two times; repeat from * until the stitch you marked has been bound off.
If decreasing 2 of every 3 stitches, work only one stitch between each decrease.