From the pattern:

These are socks I designed for my sister for Christmas; they have a wide five-rib braid down each side of the leg which then becomes a narrow cable down the instep. They’ve come out beautifully and whenever I’ve worked on them in public people have admired them loudly. They would work well in other colors or in plain solid Socka; I knit tight so you may want to adjust for gauge. As written the sock snugly fits a ladies US size 8 1/2 foot.