The way we at sharp&dapper recommends is by accessorising professionally.
A nice knitted tie to bring some life to your outfit. Maybe a nice set of braces to make your new suit trousers fall like they intended. If nothing else works I would suggest Shirt Stays. Make sure your Shirt looks its best for and important meeting or interview by preventing it from riding up out of your trousers looking scruffy as well as keeping your socks pulled up.