A sweater?
If it is just for awhile....and you don't have a hairy chest, I guess a bandage could help. If the wife wears a bra she should be good. As for the husband, dark shirts and a bandage. Or I guess you could take it out at family functions, or put in a small bar.
Your best bet would be to go to the shop and see what type of jewlery they have.
Your friend,
Prettylady