wedding outside UK but full of chi chi londoners and new yorkers, will I be a frump?

[Themasterandmargaritas]

My dh's boss is getting married in a month here and we live not too far away and are invited. The boss and gf are totally loaded, house in London, NY, Bahamas type of thing, but very unaffected. They claim it is small and casual, but what does this mean? What is de rigeur for UK weddings this season and will I stand out as an outdated, living overseas, frump, if I go in my (new) Boden wrap dress???

what about this one dont look at the price though ouch

Flattery will get you everywhere you gorgeous blonde pregnant lady.

Nice dress Jam, thanks, but I think maybe too bright? what about the Isabella wrap? Too boring?

What isabella one must have missed it?

I like this one

but I've just bought thi, it's a darker blue/purple irl.

Karen Millen tend to size a good bit smaller than coast though.