I don't have much knowledge about other countries' traditional costumes but I always thought that Romania is really special from that point of view and somehow these clothes are a lot better than most of the European countries. Too bad they are not well preserved and perhaps won't last forever.
Well, it depends where you go. We have so many regions and each of them has their own style, which makes the whole picture more colorful. Some of the Balkan countries have similar folk costumes, but I'm not an expert either :)