Because nothing is sexier than turn-of-the-century gender-bending. See also Old-Timey.
Per Wikipedia, " a recurring plot device of twentieth century filmic comedy." See also Old-Timey.
Preferably a scrappy little scamp who could be called Rags and a red-faced butcher running after him with an apron and big red cheeks looking like he's about to pop an embolism. See also Old-Timey, Pets.