Row 1: trc in 4th ch, trc in last ch, ch 4, turn.
Row 2: trc in each trc across, 2 trc in ch 4 space, ch 4, turn
Row 3: trc in each trc across, ch 4, turn.
Repeat rows 2 and 3 until you have half the yarn left.
Row 4: trc in each across, trc 2 tog in last 2 stitches, ch 4, turn.
Row 5: trc across, ch 4, turn.
Repeat rows 4 and 5 until you have three trc, including the ch 4. Fasten off, and weave in ends.
My scarf is about 10 inches at the widest point, and about 66 inches long. I used my wingspan as a guide to decide when it was wide enough, so my scarf is the same length as my wingspan.