Posh frock for wedding...with 16 day old breastfed DS

[JeffActually]

I am stumped. There is nothing at all on the high street. I have just over a week to find an outfit that makes me feel glamorous whilst feeding my dribbly DS
I am a size 14 (I think) my bum and tum are also touch on the wobbly side so I need something possibly floaty around those areas. I don't want to end up in black trousers and black top with a jacket which currently is my only option.
Budget not huge as I don't have much need for smart clothes - although we do have another wedding and christening for our DC later in the year.
Can anyone help?

this has a crossover front that opens with a popper.

That is really pretty MrsLettuce - might be a touch on the short side for my bottom.
I do have shoes that would look perfect with it though....

Depends how tall you are, the model is probably about 5'10"...

Oh yeah, forgot to mention that it's pure silk. Yum.

zip front

Pepperberry might have something good. Not breastfeeding dresses, but they often have dresses with a cross over front or something that you could feed in. I got a dress for my sister's wedding from there when I was breastfeeding a newborn.