I am not 100% sure, but I believe her shirt may be T by Alexander Wang which retails for $78. Click on the photo below if you're interested in purchasing (or click here or here to see some alternative options for less).
For a similar skirt (shorts?? It's hard to tell but after seeing the movie I thought it was a skirt...?), Ann Taylor has a great option which retails for $25 (on sale). Click on the photo below to purchase. Urban Outfitters also has a great alternative for $28 - click here to view.
To complete the look, you'll need a pair of white pumps like these from ZiGiny. They retail for $79.95 and you can click on the photo below to purchase!
What was your favorite look in the SATC 2 movie?