What is the ruling on the clothing worn by a man while swimming, which clings to the body and highlights its features due to the water? And are swimsuits an exception to the disliked nature of tight clothing?

A man must cover his 'awrah when swimming with people. A man's 'awrah is from the navel to the knee. Tight-fitting clothes that cling to the body due to water or wind and define the 'awrah are permissible; there is no sin or dislike in them.