I never normally use my tumble dryer as its in the garage and I can't be arsed, but with all the rain I've used it last week. Ds wore a pair of jeans yesterday, I can't work out if hes grown or they've shrunk. I don't think they were that short last time he wore them.
Are tumble dryers known to shrink clothes. The label said suitable for dryer.
Would be unusual for jeans to get shrunk I think. Where is it that they seem smaller - if it's just the legs then I should think your DS has grown but if they are tighter at the waist as well then may have shrunk. What are the rest of his clothes like?