Where can i find the designers/brands of the outfits worn in the movie mean girls?

There is a grey sweater worn by Lindsey Lohan with sleeves that are slit at the bottom and there is a white stripe around the inside of the hood. its worn in chapter 5 of the movie only one time by her. Its a veryy cuteee sweater and i would love to find the maker, designer or brand of it. or could u tell me where i could buy one or find the patterns to make it myself?? Thanks so much!