What color belt should be worn with these shoes?

Ask your boyfriend

He sent me here.

Walnut

But any shade of light brown will work in a pinch (if not with a suit)

Light brown? Personally, I would just wear a brown belt, as my only other option is a black belt.

Dude, you don't need a belt with sweats.

This one:

OP is a Faget. A word most here might not know.

Black garter

I always choose a belt that matches the color of the leather of the shoes.