A girdle is read as holding yourself in, both in body and in feeling. Older tradition also gives it a sense of strength gathered at the waist, ready for a task.
Has this come up in your dreams before? What was going on in your life then?
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.