This stitch pattern is very easy, once you get the hang of it.
This stitch can be a multiple of any number of stitches.
Row 1: Sl st in 2nd ch from hook and in each ch st across the row.
Row 2: Ch 1, turn. Work entire row in sl st.
Row 3: Ch 1, turn. Work entire row in sl st.
Row 4: Ch 1, turn. Work entire row in sc.
Rows 5 and Up: The pattern repeats from here on - 3 rows of sl st followed by 1 row of sc st - with the following minor change: row 5 will be a sl st row; work your sl sts into the front loops of the sc sts in the previous row.
Some of you might be thinking, slip stitch? I didn't know you can work rows in slip stitch. How do I do that?It's easy. When you're working into your starting chain, just work into the top loop. Insert your hook, yarn over, and draw the yarn up through the piece plus the active loop on your hook. Repeat.
One of the odd things about slip stitch is its height. It isn't as tall as a single crochet stitch, and one turning chain is a little bit too tall for it. But, it's either that or no turning chain, since you obviously can't work half a chain stitch. The result is a slight ruffle effect, which is fine for the edge of this particular hat and scarf. You can minimize the ruffle by making your turning chains snug.
After you work your turning chain, turn your work and do another row of sl st. Don't think about it too hard; just do it. If you start wondering which loop you should be working into, you can get confused pretty easily. Just go for the loop that looks like the TOP loop -- the uppermost loop. That's how I think of it; I find it much easier than trying to sort out what's the front loop or back loop.
Is This Fabric Reversible?
There is a very slight difference between the two sides of the fabric; on one side (the side pictured here) there is an extra decorative ridge due to the fact that one loop is left free when you crochet the first sl st row after each single crochet row.
Despite that, I do consider the fabric to be reversible; it makes a wonderful scarf, for example.
Which Way is Up?
This photo shows the stitches going horizontally, which is the direction they face as you are working them. In the actual finished hat and scarf, the stitches will be turned vertically, to take full advantage of stretch inherent in this stitch.