Thanks for pointing out that I overlooked the pattern! I updated the post to include a link to the original pattern. Here is the modified pattern used to make the scarf pictured:

MULTIDIRECTIONAL DIAGONAL SCARF

Materials: Approximately 200 yards worsted weight yarn for a 4 foot scarf 300 yards worsted weight yarn for a 6 foot scarf

Exact size will depend on yarn and needle size. For a solid-looking scarf, use the needle size recommended for the yarn, a larger needle will result in a lacier look.

Terms: Inc = knit into front and back of stitch
SSK=slip next two stitches individually as if to knit, put tip of left needle into slipped stitches
SKP=slip one as if to knit, K1, pass slipped stitch over

Instructions:
Cast on 1 stitch
Row 1: Inc into stitch (2 sts)
Row 2: Inc into first stitch, K to end (3 sts)

Repeat row 2 until one side of your triangle (i.e. not the ‘live’ edge on the needle) is as wide as you want your scarf. (The yardage given above is for 5 inches wide)

Short Row Section:

Row 1: Inc, SSK (or SKP throughout, your choice), turn.
Row 2 and all even-numbered rows: Knit .
Row 3: Inc, K1, SSK, turn.
Row 5: Inc, K2, SSK, turn
Row 7: Inc, K3, SSK, turn.

Continue in this manner, increasing by one stitch in every odd-numbered row between the inc and the SSK (you won’t need to count because you will always be SSK-ing the two stitches on either side of the gap that forms from your turn on the previous row.)

Work until you have SSK-ed the last two stitches of the row.
Next Row: start over at Row 1 of the Short Row Section.
Continue working Short Row Sections until your scarf is almost as long as you want it.

For the Last Triangle:

Work as with previous triangles until 1/2 of the stitches are on the right needle and 1/2 of the stitches remain on the left needle. Instead of starting each garter stitch ridge with an increase, start the ridge with a deccrease (i.e. K1, K2tog). Continue to work the decrease in the middle of the row as before, and after making this second decrease, both needles will have the same number of sts. When 6 sts remain, work as follows:
K1, K3tog, turn, K2
K3tog, turn, K1
K2tog, cut yarn & pull through last remaining loop. Weave in ends and add fringe if desired.