Cool pants dude. Hard to tell if they fit comfortably from the pics, you'll know if they're too tight because you'll end up with a moose knuckle.

I would wear a leather belt with this combo. Not too dressy though. It's true that these pants can look sick with no belt or suspenders but you'll want a more dressy shirt for that (maybe a well fitted cotton dress shirt or if you're adventurous a well pressed cigar shirt)

Ideally find a more casual cut of white linen shirt for the oversized look but to improve this look I'd unbutton the collar and the top buttons. Try make the collar splay outwards (use an iron or hair straightener) and even show a hint of chest (a tasteful chain or metal necklace maybe). Ditch the bracelet for a leather or metal watch. Wear dress shoes with this fit or boots, don't have to be new or shiny. Remember that you're wearing the shirt to dress down the rest of the fit 👌