It's gorgeous. I think whether it's acceptable for you to wear is entirely down to a few things including.... and I hate to say this, but your age.
I've not read the full post, so not sure if your age or any other of the below factors have been mentioned but I would say the dress is acceptable if
a) you're younger than 30 and the majority of the guests will be as well. You'd also need to consider how the dress looks on YOU - not the model. Two different people can wear the same dress and have drastically different looks when it's on. Different body shapes, accessories, even hair styles etc can make a dress look trashy or classy. Some people may not agree, but it happens.
b) often friend groups share similar taste in style and also what is acceptable. Chances are if you're considering wearing something like that others may be too. Do you know any other guests you could consult outfits with?
c) the venue, while this would be perfectly acceptable for a destination wedding in Italy, it wouldn't really be a great option for a rustic barn venue in the U.K.