Well, I think for my youngest sister's wedding we are bound to wear some type of flower. When looking at dresses the colors that she was choosing from were either Orchid or Lilac.
So, far this is what we have come up with. The dress linked above. It is a 2-piece with a shawl. It is strapless. The back of the top is neat. It zip up te bottom half and then ties up the top half. There is also a piece of fabric that can be snapped in behind the laces (so that you don't have to show skin there). It's a pretty dress.