The girl above, twitter handle Ianaya_salim reported with picture proof that she owns the same sweater that Seth wore in season 3 episode 10 "The Chrismukkah Bar Mitz-vahkka".
lanaya_salim: told every1 I had the same sweater as Seth Cohen!!! Merry Chrismukkah to all @JoshSchwartz76 http://twitpic.com/3jmgfn - 2010-12-25 19:58:24
Very cool indeed!
The details are still unknown on what brand sweater Seth is wearing or where you can buy one yourself but i'm sure you could probably get your old granny to knit you something close!
