We've finally had an official invitation (email) arrive for DH's best man's wedding, in August, in a tiny town hall in the country. Morning wedding then an evening do.
It says
"Morning ceremony - casual"
"Evening reception - evening wear"
Now, casual I can do, I have a new green jersey wrap dress from Boden that I was going to jazz up with jewellery and heels etc, but:
What exactly does 'evening wear' mean???
Full length dresses? Cocktail dress/'going out' dress? Does DH need a bowtie? 
All my confusion is compounded by the fact that I'll be BFing DS2 (will be 4mo), and having searched the John Lewis Clearance sale all I've found that I like/can tolerate/can feed in is this black one and this yellow one both of which are knee length/short and not that formal.
Any suggestions ladies?
There won't be anywhere but the toilets to feed in so I'd rather have something I don't have to take off, front opening or pull-down-able so I can stay in the main hall.
Budget up to £60-£80 max, I'm 5'7", size 14, and still sodding well look pregnant even tho DS2 is nearly 3mo 
, so will have to hunt out my Spanx and try to shoehorn them on to have anything resembling a waist...
I currently look like a stack of doughnuts.
Any help appreciated! 