Thanks everyone! It was a challenge, but a big relief to have found a dress, even if it is an ancient recycled one! I think I will get some decent use out of it now.
Carter...maybe because the style is old fashioned, the shoes didn't clash? The Vince dress was much more trendy, so it needs edgy shoes?
Celia and Unfrumped...absolutely! The thing is, fitting in okay is what was appropriate in this situation. I may have been slightly under-dressed...I found out too late that is was listed as almost black tie. As in tuxes were suggested, just not required. So I could have gone more dressy than this, but hey, I wasn't the star of the show obviously, and I wasn't even an "important" guest. I wasn't someone whose outfit would be noticed and discussed at all, and to try to be uber-special might have felt like trying to claim attention I wasn't owed at this occasion. I was decently appropriate, that's all.
So, one wedding down, one to go. It will be too cold for this by then, so I hope I can find something fantastic now! This next wedding, while technically a bit less formal, matters to me much more!