I was told about sock ons in a new mom's group.  No one had heard of them except the mom that had them.  They aren't totally stylish, but they do what is promised.  I was adjusting a pair of socks on my baby about every 5 minutes or she'd get them off.  After I put sock ons over the same pair of socks, I only adjusted 1 sock during an entire day.  Super must have!