I've been obsessing about a belt for FH. All of the dress belts I've looked at are too fussy or too bulky. But I just came across this excellent piece of advice:
GQ's Style Guy says: I never wear a belt with a suit. I don’t have belt loops. My trousers are held up by adjustable side tabs, which provide a reasonable amount of adjustment to allow for seasonal feasting and fasting. A good tailor can probably replace your belt loops with side tabs for a nominal fee, or remove your belt loops and install buttons for suspenders.
(Image courtesy of men.style.com)