Go try some on!  And while you might look a little odd having a small casual wedding in a cathedral-length train and veil, nothing says you can't still have a casual wedding while wearing a real wedding dress. They make lots of them that aren't super formal but are still wedding dresses, clearly identifiable as such. So you should definitely have a look at some; it's one of the few things about being a bride that is and should be totally focused on YOU, if you know what I mean? You don't have to consider the happiness or tastes of your guests, your family, his family, or anyone else. We were married on a yacht, and it was awesome, but we have said that if we had it to do over again we would have kept the money and had a smaller wedding instead, at the courthouse, and then a nice meal for everyone afterward at a favorite restaurant. But I still could have worn my dress for that, and I would have! :-)