Respectable guy uses a pseudonym when he wants to cut loose in a neighboring town. A friend of his picks up the pseudonym habit, and they take turns pretending to be the same person, until their cover stories get too snarled to continue.
Upper-crust city gal falls for a rough-edged working-class guy, so she follows him to his home town and masquerades as a peasant/Indian local to win him over. All very stalky and classist.