I will be making a wedding dress and need help with the neckline.  The bodice will be strapless sweetheart neckline with an illusion overlay that has lace applied to the illusion.  The wearer does not want lace at the top edge of the illusion or a binding.  Attached are pictures that show what she would like the dress to look like at the neck edge.  What do you think should be used in that neckedge to give the illusion stability and shape?  Thank you in advance for any help you can give me.