Socks are important and mine are like my boots, Salomon, wouldn't dream of anything else - having said that I will restate. Socks are just like boots just like backpacks, just like trekking poles, if you haven't already worn them in trial walks, if you have not adjusted and re-adjusted for best and comfortable fit beforehand, why the Camino is certainly NOT the place to start experiments. Know all your equipment even you underwear before you set out. Pilgrims spend so much money for transportation there and back, pilgrims set aside so much time for the Camino, pilgrims prepare itineraries and costs well before arriving in Spain but can lose it all so quickly if they think a weekend outing or two will have them and their equipment ready for 850 kilometers. If your feet can do a continuous 100 kilometers in hand knit socks go for it, if these same socks cause sore feet, redness or blisters, leave them at home before you go.