Please help accessorise this dress

[desperatehousewife2]

I have my brothers wedding in a few weeks and have as usual left everything to the last minute. Today I panicked and ordered this dress: www.fennwrightmanson.com/m/dresses/angel_rose_dress.htm and need some sort of cover, ideally a little jacket (not a cardi or shrug but possibly a wrap if it was really nice) as well as shoes and bag. Was thinking a lovely bright green might be a nice contrast? Love this sort of thing but not mad about the available colours: m.johnlewis.com/mt/www.johnlewis.com/coast-vergara-jacket-ivory/p2025657#page_loaded
Ideally, would love some sort of obi belt or sash with a big bow with a contrasting colour to tie in with the dress if that makes sense. I'm rambling a bit now but would be so so grateful for any help! Also, am in Ireland so needs to be deliverable to here. Thank you!

[desperatehousewife2]

BTW, this is the first thread I've ever started on mumsnet so please be gentle