The J.Crew Bow Skirt returns and is paired with a pale blue pearl cardigan and white tie-front blouse.
Nicolle pointed me straight to this one (and saved me a lot of searching time, so thanks, Nicolle!). It's a Leifsdottir Faux Pearl Pointelle Cardigan, and good luck finding one, because apparently it was worn on Gossip Girl, too. Recently one was sold on eBay to the tune of $199. Yikes!
The Leifsdottir line has some really cute stuff, and you can find them at Bloomingdales, Nordstrom, and Anthropologie.