My wife & I travelled to NZ, with a tour group, for a sporting event about 10 years ago. There as a hotel pool & spa, but she didn't bring any bathers with her - so she improvised by wearing black panties & a white t shirt - which of course was totally see through. Whenever anyone got in the spa, she folded the t-shirt up over itself to try to hide the assets. It partially worked...though I told my wife you could barely notice anything
One of the other men on the tour jumped in the spa & chatted to us for about half an hour. I am not sure what he found more riveting - our low level chit chat, or my wife's boobs.