From Pattern Booklet:

These directions are for small size (8-10). Changes for medium size (12-14) and large size (16-18) are in parentheses.

Notions:

• 1 pair each size US 4 and 7 (3.5mm and 4.5mm) straight knitting needles (or as needed for gauge)
• 1 cable stitch needle
• 6 buttons