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I believe it's a set. Check Nieman Marcus...or Cusp.com
Shredthreads is correct. It's a Cami and a Skirt. It's from Tibi Spring 2012. Can't help with where to buy though, sorry.
Arizona-Print Silk Tank & Pleated Maxi Skirt
dress: $198 bergdorfgoodman.com
Love this dress