For Hank: An unbuttoned, red checked shirt with a plain white t-shirt underneath with khaki cargo pants and dark boots. Throw in some extra bushy facial hair and rips in some of your clothing to really bring it home.
For Manny: Manny is a corpse, so you're going to want to make your skin look as pale, sickly, and dead as possible. Once that's done, throw on a navy blue suit with a white checked shirt and dark tie. Smear some dirt on your clothes for effect.