www.lindybop.co.uk/selema-bottle-green.html
I wore it to a wedding and felt OK but not sure it's eveningy enough. I'm size 16 to 18, not great in heels but have something I can wear which worked before.
I could dress up with blingy earrings?
The alternate option is either black sequin dress I wore last year or black velvet trousers and brown sequin top with black velvet jacket so more like a tux type effort? 
I'm not confident at womenly dressing up!