As for the mesh - I believe it was available for download to those who'd bought Double Deluxe at a certain store. I don't quite remember for sure. In any case, the mesh is no longer available for download so it's included with these recolours. The BLACK dress is the original Maxis item - it's included too since the texture is part of the mesh file. Thanks to Lord Darcy for decustomizing it.
Aug. 23, 2013 UPDATE: Added a white dress. The mesh is NOT included with the white dress. You need to get the mesh from the other file if you don't already have it.
BTW, these can all be worn as everyday and formal wear. Guess I forgot to mention that before. Whoops.
Filesize 159.68 KB | File Name BONUS - White Satin Halter Dress [mesh sold separately].rar | # of Downloads 471
And indeed Karen, the black one makes a nice elegant evening dress. That's the original Maxis colour, actually. It was just the right style - but wrong colour - for my favourite good girl sim, hence these sweeter colour options.