I have a couple of scuba dresses and they are great for not creasing so that's a bonus if you'll be doing a lot of sitting
I think that particular one though is too dowdy and casual for a black tie wedding. Doesn't look flattering and whilst I know black is supposedly now acceptable for weddings, that's quite a big expanse...
Sure there must be something better out there
What's your colouring like, are there certain shades you always feel good in?