With A, cast on 48 sts. Divide sts onto 3 double pointed needles and join, being careful not to twist.
Work in St st worked in the rnd (k every rnd) until piece measures about 42 in. (106.5 cm) from beg.
Flatten Scarf to form a 6 x 42 in. (15 x 106.5 cm) rectangle. Seam each end of Scarf closed.
With B and C, and working through both layers, embroider straight sts onto Scarf. To make even rows of straight sts, follow columns of knit sts.
Weave in ends.