A couple months ago babysteals.com had some Robeez socks on sale and I purchased a couple packs. Man, am I glad I did. Wyatt has small potato feet which socks NEVER stay on. But these socks have a trick! There is a little bit of elastic right about the foot (on the lower ankle) so they won't start sliding down his foot like most socks.
I give Robeez Organic Socks an A-. Would be higher, but they don't make them with skid-proof on the bottom...easier to wear with shoes, but a little dangerous on our hardwood floors.