Can anyone suggest somewhere that sells girls school socks (ankle ones) that stock white ones with a cotton content that's either 100% or between 80 and 100%? I've looked at John Lewis, m&s and next and had a bit of a Google but it seems to be a bit difficult. Have found knee length ones in m&s that have a good content but struggling to find short ones.My daughter gets very sweaty feet and they get sore easily so need ones with high cotton content. Thanks.