Honestly, this is where I'm at!
I have already looked at all the websites mentioned, but I do appreciate the suggestions.
If the consensus is that the ASOS dress will do, I'll keep that as back up for if the the Oh Hello dresses fail, which I think they probably will. I live in hope!
I've quite literally got a dozen dresses kicking about back and forward between me and the websites. I don't have the time, patience, or money to bother much more!
My hair appointment is booked, so tan, nails, jewellery, and possibly shoes, are all I can work with now.