Ruthie 7th heaven..same sweater as Karina on Dancing with the stars.Where can i find one?

on a 2007 episode of 7th heaven Ruthie was wearing a grey and burgundy striped sweater. Karina on Dancing with the stars was wearing the SAME one. It kind of looked like ralph lauren..but i looked there.And it has to be a sweater that was sold recently because DWTS is a LIVE show.Does anyone know where i can find this sweater?