Cotton or woolen socks...funny but I've found a number of comments about not using cotton...does that mean a lot of cotton was used?
Vanity Fair, May 18, 1861
Worsted and Worse
Our warriors must be somewhat puzzled by the contradictory suggestions thrown out for their benefit by the daily press. One writer requests them on no account to wear any other socks than cotton socks, when marching. The Tribune, on the contrary, asserts that they must wear worsted ones if they want to save their country and their corns. We go in for GREELEY, this time. The many who sticks up for the Cotton is open to a suspicion of secessionism; while GREELEY is consistent in standing up for the Wool. We think the Cotton man will be Worsted.