King of the Hill S07E09 - Pigmalion

Peggy forces Luanne to quit her job as a waitress, and then signs her up for a course on enterpreneurism. There she meets Trip Larsen, head of Larsen Pork Products. Trip takes an interest in Luanne, and she soon becomes his girlfriend. Peggy suspects that Trip may be crazy, but when she orders Luanne to break up with him, Luanne refuses and moves in with Trip at his mansion. Trip forcibly dyes Luanne's hair red and makes her dress in a milkmaid's outfit. Luanne discovers that he is trying to turn her into the Larsen Pork Products Girl, an advertising character his grandfather created.