I think that if you have got a dress that you love, there isn't really a reason to get another. I think that the dress you have has a timeless elegance to it (so who cares what current trends are!) Also I wouldn't be bothered what your fiancee had at his previous wedding, and what his previous bride wore. People are not gooing to look at you as you walk down the aisle and say "gee, that looks like the ex's dress" they are going to be thinking about how gorgeous you look and how happy they are for you. If they don't then it is their issue.