I feel stupid asking this to be honest,
I see most belts online (ie Hugo Boss) are about 1 1/8 inches wide ( 1.125 inches) ~2.86cm.
but the black belt I wear to work is 3.5 cm (or 1.3 inches) wide - and basically fills the up the belt loop space which to me looks better then having a skinny belt and then having a more of the waist exposed. I understand that most wide belts are used for Jeans, but the one I use is fancy enough to get by.

So whats the deal- Do I slim down the belt width for the work enviroment, or does everyone else have it wrong and should be going wide?