From the Knit Rowan website:
Knit this ladies shrug with pretty trellis stitch pattern from Elegant Knits. Designed by Martin Storey using the wonderful soft blend Wool Cotton 4ply (wool and cotton), this knitting pattern is generously sized to fit up to 50 inch bust.

The 4mm needle size is listed only for binding off.

Finished cuff to cuff dimensions:
76: 84: 92: 100 cm
19: 19: 20½: 20½ inches

Yarn Information:
Photographed in Flower 485
5, 6, 8, 9 skeins
985, 1182, 1576, 1773 yards