Help me find an outfit for a wedding, please,

[GruffaloPants]

Going to a fairly informal wedding next month and I don't have anything I want to wear.

I'm 6', usually size 10 but currently have more of a tummy as I gave birth relatively recently. Can tend to look a bit beanpoleish. Pale skin, dark hair, suit blues and some reds. I like a bit of draping around the neck/bust eg cowl necks or the stuff Vivienne Westwood does, but not essential.

I'd really welcome any recommendations. Budget around £100, But would go to £250, maybe even £300 for something special that I'd wear again. Help me please!

[GruffaloPants]

Ps I don't suit/like empire line or trapeze shapes, and I don't manage well with thin straps as I like a "proper" bra.