Ds is 7 and wears a pull up in the day he has asd and is always hardly ever still, his school trousers tend to slip down a bit after a short while of being on the move so they sit under his hips and hang too low despite the waist being as tight as it can comfortably be. Does anyone else have this problem? At home he wears elasticated waisted jeans or joggers and they are fine. Looking for any recommendations for stretchy comfortable school trousers that stay up? Thank you