This pattern gives instructions for both bandana and shawl.

Sizes
Bandana
Approx. 120cm (47in)wide x 51cm (20in) to point
Shawl
Approx. 140cm (55in)wide x 71cm (28in) to point

Pattern errata
There is a ‘yo’ missing on all RS pattern rows from row 15.
There should be a yo after SSM, K1, SSM, on every RS row to make 4 increases every RS row, either side of the 1st & last stitch and either side of the central stitch.
I hope this helps, sorry.

The pattern correction starts as follows:

Row 15 (inc)(RS): K1, yo, K to marker, yo, SSM, K1, SSM, yo, K to last st, yo, K1. (33 sts)
Row 16: K3, P to marker, SSM, P1, SSM, P to last 3 sts, K3.
Row 17 (inc): K1, yo, K to marker, yo, SSM, K1, SSM, yo, K to last st, yo, K1. (37 sts)
Row 18: K3, P to marker, SSM, P1, SSM, P to last 3 sts, K3.
Row 19 (inc): K1, yo, K to marker, yo, SSM, K1, SSM, yo, K to last st, yo, K1. (41 sts)
Row 20: K3, P to marker, SSM, P1, SSM, P to last 3 sts, K3.
Row 21 (inc): K1, yo, K to marker, yo, SSM, K1, SSM, yo, K to last st, yo, K1. (45 sts)
Row 22: K3, P to marker, SSM, P1, SSM, P to last 3 sts, K3.
Row 23 (inc): K1, yo, K to marker, yo, SSM, K1, SSM, yo, K to last st, yo, K1. (49 sts)
Row 24: K3, P to marker, SSM, P1, SSM, P to last 3 sts, K3.
Row 25 (inc): K1, yo, K to marker, yo, SSM, K1, SSM, yo, K to last st, yo, K1. (53 sts)
Row 26: K to marker, SSM, K1, SSM, K to end