Here's a favorite pattern:
Size 8 needles. Knitting Worsted.
Cast on say, 54 sts. K2, P2 for 2 rows. Then do K2, YO, P2tog across. Then do 2 more rows of K2, P2.
Now do garter st. for 6".
Then bact to K2, P2 for 2 rows, do K2, YO, P2tog across, 2 more rows of K2, P2. Bind off.
Using needle or crochet hook, thread a double-strand of yarn through each row along one short edge, going from the K2 edge through the garter st. to the other K2 edge. Pull tight and tie - this is where the toes go.
Now take a length of heavy yarn, 3x the length of the K2-P2 edge. Working from the toe, thread the yarn through the YO holes as if you were lacing up a shoe. Pull tight, tie off with a pretty bow.
For children, use smaller needles and cast on fewer sts. For long slippers, cast on more sts.
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