I had a similar situation once at a hotel pool. A pretty woman was diving in and out of the pool with a 2-piece. She dove in once more, then got out and one of her breasts was fully bared. There were not too many people around the pool, so I was wondering if it was worth the risk to say anything. Anyway, not too long afterwards, she sudently jumped in the water, and it looked like she had discovered the problem
About 30 minutes later, the woman was swimming some laps and my sister came along and I told her about the incident. My sister did not believe me. Well, low and behold the woman stops swimming the laps, and got out of the pool, and she is still exposed!
This time, there were many more people around, and she immediately notice some people staring and looked at herself...
JAG