Costumes are adapted to the development of the characters in 13 Going on 30
At the beginning of the film, the protagonist of our movie is in her room. She’s showing her mom the magazine of things that 30-year-old women own and, in one of the shots, we can see the picture of a huge walk-in closet that’s illustrating a fashion article in the magazine as well. A few scenes later, when the protagonist finally turns 30 years old, we can see the same closet in her apartment, which makes us think that the protagonist has followed the dreams she had since she was a teenager.