A bra is read as support, femininity and how you hold yourself together. Dream books link it to comfort with your body, or to the feeling of being shaped by others’ expectations.
Where in your waking life have you met something like this lately?
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.