you might want to look at a sporting goods store, they usually sell children's soccer socks, which come in a number of colours.

Otherwise, if you have a "wilderness outfitters" around you, like Cabelas or REI, they have kid's hiking socks which work.

If you don't mind ordering off eBay, THESE are decent kilt hose for the price, especially for small ones whose feet tend to outgrow stuff before they wear it out.

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