Eloping, need a dress help!

Me and my partner are eloping, just the two of us , out doors next to mountains and a loch on a Scottish island, I'm stuck on what kind of dress to buy. I want to feel like a bride but also don't want my dress to be too over the top since it is just the two of us and we will have to go on a boat to get to the ceremony place as well as walking in muddied areas, after we may also just go to a local restaurant instead of a reception. Any ideas? Pictures? I will be getting my hair and make up done professionally and the groom will be wearing a 3 piece tweed suit .

Thanks