Here's my problem: if I knit the cardigan fronts as usual with variegated yarn, the fronts will not match each other and the stripes on the fronts will be twice as wide as the stripes on the back. I don't think that would look good. Hmmm. The answer, I decided eventually, is steeking. I'm knitting the two fronts together and will then cut them apart when I've finished. Yikes. I'm working 5 extra stitches between the two halves. That's where I will secure the knitting with two lines of sewing, cut and then fold the extra stitches back to form a facing.