Caroline of Monoca and Stefano Casiraghi. Stefano does the tie tuck and wears his trousers on his natural waist. Not on his hips. Trousers are not jeans, so they should not fit like jeans. Higher waisted trousers are more comfortable and prevent the  showing of shirt underneath the middle button of the coat (when buttoned). This tends to ruin proportions and looks messy, just like too short or too long jacket sleeves.