Ava is wearing a Marc Jacobs three piece suit from the fall winter 2010/11 collection with a Salvatore Ferragamo shoulder bag.
You can shop at net-a-porter a pair of Angora-blend tweed pants by Marc Jacobs :
Add a Strand wool-blend blazer by Rag & bone :
A Marc by Marc Jacobs blue Pleated denim shirt :
Animal print heels, like these Miu Miu Calf hair leopard sandals :
And a Marc by Marc Jacobs Ukita leather bag :
All these items are now available at net-a-porter.