I second the tutu recommendations. Tulle is really easy to work with, since it doesn't ravel, and it's super cheap. Get some and play with it.
The top (there really isn't much of it, is there!) looks like a doily with a ribbon sewn on it. You could collect some old doilies and piece them together (or sew them to a tank top you like the shape of) to make a less revealing top.