This family-of-three costume is a classic! Where's Waldo is not only cute and charming but it totally vibes with your striped nautical wardrobe so it's super easy for a last minute costume! Be prepared to get lost a lot at the party, "You haven't seen . . . Waldo, have you?" See all of Say Yes's family costume ideas here, and the Waldo costume tutorial in its entirety right here.