Dress for size 16 - for a party?

[carriewintermeadow]

The only dresses I wear are tunics with leggings, usually knitted. But this Saturday I'm invited to a birthday party and wanted to wear something a bit fancier. Its not a very posh party and actually there's a woodland theme but its not obligatory so I'm going to ignore it

I've no idea what to wear! I've not much waist, apple belly, don't wear heels. I'm 5 foot 7, dark long hair, brown eyes, 34gg chest.

Usually go for low scoop or v neck otherwise I look matronly.

Any suggestions? With links would be great

TIA