A nalbound sock was found in Viking-age York (also known as Jorvik). Although the Romans and early Egyptians also made socks in this way, this is the only piece of nalbinding which has been found in Britain.
It's not easy to buy pure wool nowadays so I was very pleased recently to meet a man who sells his pure Shetland wool by mail order. It comes in a range of natural colours and is ideal for knitting or nalbinding.
This reconstruction is made in Shetland fingering wool from Jamieson and Smith. The original is a little shorter and has only one row of red at the top, but otherwise the two socks are very similar.