Thinking of knitting a fair isle jumper, want one in monochrome, so black, grey and white. Read the pattern, most of it makes sense, except for the bit where it says, strand yarn not in use loosely across wrong side of work (I understand that bit but, then) over not more than 3 sts at a time to keep fabric elastic. But then the chart shows the colour changes occur on some rows over more than 3 sts.
So what do I do with it, if I can't carry it over 3 sts? I'd really appreciate some enlightenment.