Dreaming of a bathing suit means you are ready to be at your most vulnerable to fully become the person that you want to be. While a bathing suit provides you a cover from being completely naked, the importance is how you feel in a bathing suit to determine your level of vulnerability and confidence.
Being vulnerable allows you to connect stronger with people you come across because we all have flaws and showing people these flaws helps to earn their trust.
Also, a woman dreaming of a bathing suit could represent her desire to be seen as more attractive or beautiful. From this point of view, the bathing suit represents her self-esteem and how she feels about herself. If a young girl dreams of wearing a bathing suit, it may represent sexual development or sexual feelings. In this case, it would also suggest her feelings about being grown up and becoming sexually aware.
It can also represent being happy and carefree, so if you see yourself wearing one in your dream it may mean you are having fun or feeling carefree for some reason.