medieval wedding outfit

Traff and I are invited to a medieval/fantasy themed wedding in august- I've been fussing over this for ages because the wedding is entirely outside- so if its hot I don't want to cook, but if its rainy I don't want to be too soggy and miserable.
I have finally found an outfit!

It's a floor length black crepe silk dress with beady detail- pretty- see:

I'll wear it with a belt and maybe make some big chiffon sleeves for it so its a bit more fantasyish. might wear my moroccan shoes with it.. :D maybe also find a necklace to wear on my head..

Traff is planning to dress like this- maybe with some contact lenses to make is eyes either entirely black or white: