Ordered it! I have nude fairly low heeled sandals (that I bought for a different wedding and didn't wear!) that will probably be good with it, but I'm going shopping with a friend on wed so I can buy a bag then.
As far as jewellery goes, I have a lovely rose gold bracelet that I think would work well. I'll raid town for a necklace, the friend who is getting married runs a vintage shop I'll ask her to keep an eye out for me too.