In the episode, The Not So Ugly Duckling, Jan is talking to her parents in the living room. Jan is mad at Marcia and is wearing a white shirt with some kind of design on it and a red ribbon in her hair. After she gets done talking to her parents, she marches upstairs to confront Marcia. Watch carefully and you will notice that Jan is wearing a complete different outfit- a green blouse with a green ribbon in her hair.