Wedding guest at 12 weeks pregnant. What do I wear?!

[IthinkIneedmorewine]

This is my first time posting in S&B, so be gentle...

I have a wedding to attend in 5 weeks, by which time I will be 12 weeks pregnant. I'm already suffering a very bloated tummy so don't want anything too tight. No one at wedding will know about baby, so I want to disguise the fact :)

I'm 5'6" and a size 10, and would usually wear very fitted, hourglass 50's type dresses, so I'm a bit unsure of where to begin!

Any ideas?

Watching this thread carefully. I have to go to a christening - and become a godparent! - when I'll be (fingers crossed) 12 weeks pregnant. It's not just the don't-want-to-tell-anyone thing, it's also the I-look-really-fat-but-not-remotely-pregnant thing, I've found in previous PGs.

Am debating splashing out on an Isabella Oliver dress (maybe something like this or this and dressing it up with accessories. Figure I can always ebay it if it all goes wrong (christening is just before my scan, annoyingly).

Thanks both for the suggestions. Have tried on my Vivien of Holloway dresses today and they are too tight, but might order a lady v dress and check the fit.

Love the Isabella Oliver dresses too, but worried that they may be too far out of my comfort zone....