What are your accessories going to be? I'm not a particular fan of ^^ those shoes, esp. with an emerald green dress. It may be nice for a glint of shimmer on your feet...perhaps a soft gold or silver strappy sandal? There are some shoes with a slim wedge heel for a sleeker finish without the strain of a thin heel or bulk of a super wedge.
Is there anyway you could post a pic of the dress, so your GC fashion consultants can better assist?
ETA: Definitely just realized you probably bought the shoes already. If so, show the world! We're dying to see!