I wore this for a few hours in the afternoon for my City Hall wedding and then lunch. It is Dessy Collection from Nordstrom, separate top and long skirt. The top is crop top and the skirt is high-waisted so it looks like a one-piece.
Full Length Tulle Skirt Description: Halter Style Crop Top Description:
Note that the top is a taupe underlay with ivory lace on top. Just like the picture in the second link (not like the top in the skirt link).