I feel 'modesty' is not solely about what we wear. It is possible to be covered head to toe and still to act or speak immodestly. Similarly, as anyone involved in healthcare will tell you, a partially clothed or even totally naked human body is not of itself immodest. It all depends on context and behaviour.
As for men viewing women's sports, the same could be asked of women viewing men's sports - what is the intention of the viewers? Do they wish to observe the skill of the sports people are do they have some other motive? Only they have the answer.