Actress Mischa Barton has revealed that she played a significant role in choosing Marissa's clothes, explaining to Elle in a 2014 interview: "I started getting Chanel to send stuff. I started having these designers send stuff over because I saw the merit in getting that kind of stuff on television. If I had those connections in the fashion world, why not? [The wardrobe department] would totally have been happy just dressing us as regular teenagers, to be honest. Not in a bad way, we would have looked adorable, but we would have been just your average Orange County teenagers. But with my wiling and conniving I was like, "You know what would be super great is if we could get this Chanel dress for this [prom] episode," and it kind of all came together."
In the same interview with Elle, Barton explains that "the show and the wardrobe broke ground", naming the costume designers and stylists as reasons for the success of the series. Marissa Cooper's designer-filled wardrobe, which featured gorgeous Marc Jacob's dresses and Chanel handbags, supplied fans of the show with some serious style cues and inspiration.
Other nostalgic fashion trends from the 2000s that featured heavily in the O.C. (and that are making a huge comeback) include micro miniskirts, cropped pirate pants, cargo pants, dresses over jeans, peasant tops and lacy or silk slip dresses.