The safety vest stands for the wish to be seen so that no harm comes. Dream books read it as caution, responsibility, and the role of keeping order while others pass by.
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.