Fairfield slipped-stitch shawl

Easy slipped-stitch shawl or scarf

Free Ravelry download here.

                Designed by Alethea Drexler, December 2016.  Please share as much as you like but keep my name on it.  

          This was knit originally as a shawl but it is, admittedly, a bit tedious and a moderately skilled knitter will probably prefer it as a scarf, with a narrower border. The finished piece has a plain body with raised lines, a diagonal rib border, and is reversible.
          This is written for worsted-weight yarn (Lion Brand Wool-Ease; a lot.  Like eight skeins) on a 32-inch US8 cable needle.  The original shawl had 12 rows of border on each end and 10 stitches of border on each side; a scarf would probably look better with a narrower border and would need fewer rows/stitches.
Cast on stitches in a multiple of 8 + 7, plus the stitches you need for your border.  For a large-ish shawl, I cast on 16 full pattern repeats, so:

8*16 + 7 + 10*2 = 155

 . . . which ended up being just about 30 inches wide.  The chart below shows two pattern repeats.
The most important thing to remember here is to always purl the slipped stitch on the opposite side so that it creates the raised line. 

Border pattern (by far the harder part!):
Row 1: K2, P2 to end (you will end with a single stitch of either knit or purl)
Row 2: P2, K2 to end.  From now on, all wrong-side border stitches will mirror the right-side stitches: Purl the RS knit stitches and knit the RS purl stitches.
Row 3: P1, then K2, P2 to end.
Row 5: P2, K2 to end.
Row 7: K1, then P2, K2 to end.

Continue this pattern, moving the rib pattern over by one purl or knit stitch as needed at the beginning of every RS row, even after you begin the pattern body. 

All RS rows: Knit 3, *slip 1 stitch purlwise, knit 3, purl 1, knit 3*, knit 3
All WS rows: Knit 3, *purl 1, knit 3, slip 1 stitch purlwise, knit 3*, knit 3

Pattern chart

(thank you, Stitch Fiddle)