Inspired by the Piranesi Edging stitch from Donna Kooler’s Encyclopedia of Crochet. The white version shown in these photos is made with King Cole Smooth DK yarn (main colour) and Young Touch Cotton DK (contrast). The green one is Sirdar Country Style DK (main colour) and Madil Eden Print (contrast).

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Supplies:

• 1 large skein double knitting yarn (about 300 yards)
• 1 small skein double-knitting yarn in a contrasting colour (about 100 yards)
• size H (5mm) crochet hook
• tapestry needle

Stitch guide:

• ch: Chain
• sl st: Slip stitch
• dc: Double crochet
• hdc: Half double crochet
• cr st: Crossed stitch (sk st, dc in next st. Working behind dc, dc in previous st.)

Instructions:

Make two ruffles as described below, then join them along the straight edge.

Ruffle of fans – First fan

• Ch 9 and sl st to make a loop
• Rnd 1: Ch 3 (counts as first dc), 10 dc into loop, then turn — 11 dc
• Rnd 2: Ch 4 (counts as first dc), sk first dc, (dc, ch 1) into next 7 dc and turning ch of previous round — 9 dc
• Rnd 3: Ch 5 (counts as first dc), sk first dc, (dc, ch 2) into next 7 dc and turning ch of previous round — 9 dc
• Rnd 4: Ch 6 (counts as first dc), sk first dc, (dc, ch 3) into next 7 dc and turning ch of previous round — 9 dc
• Rnd 5: Scallop edging: into each ch-3 space, sc, hdc, dc, hdc, sc — 8 scallops
• Repeat 11 times

Ruffle of fans – Repeated fans

Repeat 11 times

• Ch 9 and sl st into dc dc of last scallop of Rnd 5 of previous repeat to make a loop
• Rnd 1: Ch 3 (counts as first dc), then 8 dc into loop, then turn — 9 dc
• Continue Rnd 2 through 5 as above, except:
• At the end of Rnd 2 and Rnd 4, sl st to dc of previous repeat (Rnd 2 into second last scallop of Rnd 5, Rnd 4 into third last scallop of Rnd 5)

Straight edge

• ch 1, turn, and sc back across the straight side of the work (3 sc in each 9-ch loop, 2 sc in the first dc of each row, 1 sc in the last row of each repeat)
• Change to contrasting yarn
• ch 3, turn, cr st across
• Tie off

Finishing: Join ruffles

If you want the scarf to lie flat, I would suggest sewing the two ruffles together instead of single crocheting, as is described here.

• Line up the two pieces, straight sides together, with repeats slightly staggered (the beginning of one repeat should be lined up with the 9-ch space of the other piece) sl st into sc of the last row of one repeat ch 1, 2 sc up side of the Crossed Stitch 3 sc into corner to turn
• sc along the top of the piece into top of the Crossed Stitch row
• At end of the row, 3 sc into the corner to turn, 2 sc into side of the Crossed Stitch
• sl st into sc of the last row of the other piece, tie off
• Weave in ends