Throughout Legally Blonde, Elle is called “a Marilyn, not a Jackie” the reference being to former First Lady Jackie Kennedy.
Then, in Legally Blonde 2, Elle has a scene where she’s picking her outfit for her first day of work on Capital Hill. She goes through her wardrobe and compares them to other famous women in politics. She finally settles on the outfit that’s “too perfect for words.”
In the next scene, when she is walking up the steps, she is in her classic pink but is also wearing a pillbox hat, pink suit, and white gloves, all signatures of Jackie Kennedy.
This is the perfect parallel to Legally Blonde one, but also serves as the signal to the audience that Elle has combined the two figures. She is saying that she isn’t Marilyn INSTEAD OF Jackie, she is Marilyn AND Jackie. The two are not mutually exclusive.