1) I am not too much help as to where you would buy a dress, but I would suggest a maternity dress as it compliments your bump alot more than a large size dress taken in. I wasn't very big at all at 7 months pregnant and still sleeping on my tummy, everyone is so different so it is so hard to tell about sizing,

2) Yeah ok it is a Thursday and late notice for some, however if it offers any hope, I received an invite last week to a wedding in Perth (I'm in Melbourne) and the wedding is November 29th, I have a 3 month old daughter that was in hospital until 4 weeks ago, and yes I am going to the wedding! If they are true family and friends they will be there no matter what.

3) An outside wedding is always nice, but then you can never predict the weather - is it a chance you want to take? Maybe you could hire/buy (you could re-sell on ebay) a small gazebo (you can get them cheap at Big W and they are nice iron with cream canvas), this could at least be a cover for the bridel party if it rains a bit (everyone else can use an umbrella, he he)

4) Yeah why not - it is your day, not hers - don't let anyone ruin it for you!

I wish you the best of luck