To dream of a swimsuit represents an aspect of your personality that is totally focused on confronting uncertainty or a negative situation.
The symbolism is based on water reflecting uncertainty or negative situations. The swimsuit then reflects your personality as it deals with this.
The color of the bathing suit is very important. Blue represents a positive outlook, red is negative, and white symbolizes purification or genuine intentions. If you see polka dots on a swimming suit it reflects awareness of yourself dealing with a problem all the time.
Example: A man saw a woman in a blue polka dot swimming suit by the beach. In real life he was confronting a life threatening health condition. The polka dot swim suit reflected his personality constantly struggling to confront his problem. Something he had to do all the time to improve his health.
Example 2: A woman dreamed of trying on bathing suits she was considering buying. In waking life she had gotten pregnant and was considering the best way to tell everyone.
*Please See Bikini