Dress with "access" for going to a wedding.

[KatAndKit]

I will be attending a wedding soon. My six month old baby is still breastfeeding and so I need to be able to feed in whatever I am wearing. I have lost a bit of baby weight but have ginormaboobs now that I am bf so am still needing about an 18 or a generous 16 and nothing too tight on the tummy either.
JoJo breastfeeding dresses are too casual, as is most of the rest of my breastfeeding wardrobe. Last I checked Milkchic it hadn't been updated much. Don't want to spend loads of money on a pricey breastfeeding special dress, ideally want a normal dress that will still work with a nursing vest under it.