The link doesn't work so I googled the dress. I hope you got it for the bargain price online!
The top is quite architectural so you want something quite plain that lets the styling stand out. The website has a matching edge to edge jacket but it might add bulk -as a busty shorty I avoid bulk!
I have a very light weight oatmeal-ish edge to edge floaty long line cardigan with self coloured sequin trim that would be great with it. Sadly I cannot remember where it came from, maybe Primark. I have had it yonks and it is so neutral it works as an upper arm cover up for anything. I think thats what the dress needs. Something very light and neutral that lets the structure of the dress stand out. Nothing drapey or statementy . A cream or camel cashmere cardigan would be great but not shrug length, that would spoil the line. And not a pashmina, that would also take away from the structure of the dress.
Shoes, you could go crazy with high shoe boots or rock a nude /brown/black court. It depends on your personal style. I don't think any sort of sandal would be right - the dress is formal so I think a covered foot and tights would look best at an Autumn wedding.
It is a lovely dress. Let us know what you opt for.