Evolution of suits over the years

[Torchwatch]

At any time where performance takes priority over modesty then sportswear becomes briefer and/or tighter. When modesty takes over due to child protection, homophobic or religious issues sportswear becomes longer, baggier and looks more frumpy.
Performance demands that a swimmer in a tight brief suit shaves.
When materials that perform better than naked shaved skin are permitted than sportwear design can go anywhere, and resulted in bodysuits for swimmers.
Big baggy shorts accepted by prudes and frumps are great for sports fans, they can look sporty wearing the same gear as their heroes whilst tanking up on 10 pints of beer in a bar.