Bargain cocktail dress?

[Polkapjs]

I’ve an event in Jan but I’m on the quest now for a frock - I’m short with a pear with added bonus of big belly. Any ideas? I’m in need of your help please. Black to help me blend in preferably. Or dark green (reddish hair). Thank you! Size 14

I have this and I'm very pleased with it
www.quizclothing.co.uk/clothes/00100016506.html

not sure if this is dressy enough but it's a bargain & very flattering

images.primark.com/productsimages/N35397177848258-large.jpg?d=1

I bought a size up as I wasn't sure about the fit over my boobs

Debenhams have large reductions atm.

Thanks all. Just don’t know what shape to swathe myself in. My belly is awful