I love Fair Isle, and I love knitting socks. Trouble is, the two don't play well together because Fair Isle is far less stretchy than stockinette. So the socks look pretty but are hard to get over the heel. Is there a way to add some stretch to a knit stitch? I know there are cast-ons that are stretchy by virtue of some added wrapping or twisting; the extra yarn used builds in some stretch. Is there a similar trick for a knit stitch? If there were, you could incorporate it in stranded color work.