My dress is Kendra by MS in Alabastor and I am thinking of adding a black sash just under the bust line/natural waist. Nothing to over the top, but just enough to add the pop I think it's missing. Here are a couple I found on Etsy and I just wanted your opinions.
My dress...

Sash ideas...
Re: To sash or not?
If you did any sash at all I would do one that consisted of rhinestones and other bling to coordinate with the embellishment at your hip.
http://www.etsy.com/search/handmade?q=crystal+bridal+sash&view_type=gallery&ship_to=CA