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How about buying socks for people with diabetes ? No toe seams, no elastic tops, often made from bamboo or synthetics with moisture-wicking properties.
Also, could the uncomfortable feeling be due to washing powder with biological enzymes ? Or scratchy labels ? Synthetic fibres don't usually have moisture-wicking properties as standard and could make your child feel too hot.
My son was like this with his school uniform. I went through LOADS of shirts one year trying to find some he'd wear.
Ring Next the clothes shop as they told me back then I could keep ordering and trying clothes for my son until I found some he’d wear, and they’d always refund me because of his problem.
I didn’t know this until afterwards though. I wonder if they still do that.