Sisters, Not Twins:Mary & Martha are is the second sock in volume 2 of the Fairly Odd Socks collection, a collection of odd pairs of socks.

The pattern features a slip stitch colourwork pattern which is slightly different on each sock. As with all the socks in the Fairly Odd Socks collection you can make two pairs and then mix and match to your heart’s content.
As these are ankle socks, one skein of each shade of the suggested yarn (or similar) should be enough.