From pattern:

MATERIALS: Panels subtly decorated are used for these attractive socks. Knitted in a slip stitch pattern, they are so easy to make. Lady Galt Kroy 3 ply (50g): 2 balls main colour B and 1 ball contrasting colour A will make all foot sizes in both lengths. Set of four 2 1/4 mm (NO. 13), (U.S. 1) knitting needles (points at both ends) or whichever needles you require to produce the tension given below.

MEASUREMENTS:
Standard Length - Length of leg to bottom of heel flap 13 1/2 ins (11-inch leg).
Shorter Length - Length of leg to bottom of heel flap 10 1/2 incs (8-inch leg).