Ralph Lauren Mens Single Breasted 2 Button Navy Blue Wool Blazer Sport Coat Jacket - Size 36R worn by Eric van der Woodsen (Connor Paolo) in Season 3, Episode 4 “Dan de Fleurette”
Similar Match
“Eric is talking with Jenny on the first day of school. He is wearing the blazer paired with a yellow dress shirt and tie. Pictured item is similar, but does not have the school crest/logo”