The princess dress stands for fantasy, wonder and the wish to be treated as special. Dream books read it as a childhood dream returning, or a longing for a little more magic now.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.