My local Nordies and AT had no formalwear to be found, and Macy's had about four "social" dresses on offer, none of which were appropriate. However, BCBG had a couple of things to give me an idea. I went straight from work, so I don't have the spanx on.

1-2 is a size 4 in a mesh fabric and an A-line skirt.
http://www.bcbg.com/product/in.....age=family

3-6 is a size 2 with satiny tiers. The 2 didn't feel much different than the 4, because the tiers are all attached to mesh, but the 4 is probably better and less skin-tight looking. I don't love the side-boob issues with this one. However, I like the narrower A-line, and I think it's pretty close to the shape of the skirt on the one I ordered from Ebay.
http://www.bcbg.com/product/in.....age=family

7-8 is a size S, which is a 6 according to their size chart. This dress is nice, but it's not on sale, out of my price range, and for some reason the cups were very lumpy, which really ruins the nice draping. Maybe it's because I needed a size 4? They didn't have an XS for me to try on in this one, but since it's too 'spensive, it's a moot point.
http://www.bcbg.com/product/in.....age=family

This is the Ebay one, which I ordered in a 4.
http://www.bcbg.com/product/in.....age=family

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