White shirt: Always OK. Often essential.
White sweater: You can rarely wear them in the summer anyway. Has a cool arctic camouflage sort of effect in the dead of winter. Wear whenever weather permits.
White pants: You're obviously looking to pick up some rough trade at a South Beach disco, so why stop now?
White suit: Only if someone's getting married on a beach.
White shoes: High school is over. Let it go, man.
White belt: Sort of like reflective tape, this serves to warn everyone that an insurance agent is headed their way. A welcome public service.