OTCs are awesome, and it's great that they're available in argyle, which is something I have yet to see in front of my own eyes. Scrumhalf, where did you buy those socks?
You may not like the answer and it is sure to draw some snickers from the purists, but: I got them from an outfit called http://www.sockittomesocks.com. It is a local Portland company that sells mainly women's socks but carries a line of OTC women's argyles that fit me just fine. My shoe size is 8.5, so women's sizes fit me just fine. If you have a smaller foot size like I do, this may work for you. If not, I believe Ben Silver carries a line of OTC argyles but they are considerably more expensive. Here are the argyles they carry that I either have or would consider buying (some of the others are in shades of pink that are best suited for the fairer sex, I think )