a promise of luxury for those not smart enough to make a decent outfit. You can't fix a bad outfit simply with a belt, aside from shaping your form.
Just look at this distinguished gentleman – a run of the mill streetwear in combination with shiny belt and necklace. It's tacky.
If the rest of his outfit was more eccentric, think of prince or earlier micheal jackson, it would work. Or just go the full pimp way