Rub the dirt in and use the grapejuice or wine to give it that 'wino look'. You can do the same with pants. Also at the Salvation Army, look for a really beatup trenchcoat. You can add dirt to this and cut it up some, to give it the proper completion. Add to this any cheap fake jewelry you can find, anything you think would be thrown into the sewers after a mugging or something.
Pillows make good hunchbacks.
Tuna juice is also very effective. If you're naturally a visible and outgoing person, it may be a stretch. A good way of doing it is always looking for the darkest corner of a room and sort of revolving your travels around that corner. Multiple Nosferatu, should of course pick multiple corners. Skulking is also a good way to hide makeup deficiencies.