The tie is read as convention and the rules of a formal world. Dream books also notice it sits at the throat: a tie pulled tight can stand for duty that keeps your words on a short leash.
When this appeared in your dream, what were you feeling?
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.