ERRATA
There is a stitch increase missing from Edging row 3.
The pointed cast off edging is worked over 301 stitches.
The Garter stitch edging pattern should be as below.

Now work 6 rows in garter st for edging patt as folls:
Edging row 1 (RS)(inc): K3, yo, K to marker, yo, SSM, K1, SSM, yo, K to last 3 sts, yo, K3. (289 sts)
Edging rows 2 & 4(WS): Knit.
Edging row 3 (RS)(inc): K3, yo, K1, yo, K to marker, yo, SSM, K1, SSM, yo, K to last 4 sts, yo, K1, yo, K3. (295 sts)
Edging row 5 (RS)(inc): K3, yo, K1, yo, K to marker, yo, SSM, K1, SSM, yo, K to last 4 sts, yo, K1, yo, K3. (301 sts)
Edging rows 6: Knit.

Shawl (wet blocking dimensions)
Approx. Wingspan: 125 cm (49 in)
Approx. Length: 56 cm (25 in)

Yarn
Knitted in Cashmere Lace

Needles
4 mm (US 6) circular knitting needle
2 stitch markers

Note
Because of the large number of stitches I suggest using a circular needle.