Clothing in a dream can signify the persona or the mask you wear as your identity undergoes transformation. When the dream focuses on a bathing suit, it can symbolize your willingness to ‘dive deep’ into the waters of the unconscious which often occurs when you are going through therapy. Being on vacation and forgetting your bathing suit can be a message about the need to stop covering or protecting something. The bathing suit can signify your unwillingness to reveal yourself.