Please help Cinderella go to the ball

[1dilemma]

Ok so I'm more of an ugly sister
I have to go out tomorrow to a dinner/dance type thing for dh work.
I had a baby some months ago and have really struggled to loose the weight this time, hence NOTHING I own fits me (and I mean nothing I'm about to go and get some simple black trousers for work tomorrow because I have no others)

Does anyone have any idea what I can wear? preferably not too expensive since I really hope I loose the weight and we NEVER usually go out so I wont get much chance to wear it again.
I'm short a size 14 ish that wants to be a 10 brown hair brown eyes and have loads of extra weight around my abdomen and lower chest

Any ideas gratefullr received (I live in London so lots of choice re shops) I have no idea whether it will be all long dresses or not

She did have a waist(ish) after control pants but she showed me in the toilets what was underneath and it was not pretty... all wrinkly and flabby (she was doing this as I am pregnant and wanted to forewarn me!)

It goes up to a size 18 as this is what size my friend was in. So flattering, I wouldn't have put her at a size 14 and nearly fell over with shock when she told me she was in a size 18!! If you like it I'd definitely go and try it on, loads of Monsoons in London

delimma, what did you get???