I've noticed that sportswear in the Olympics (as they often are in competitive sports) are extremely skimpy, not for fashion, but for practical purposes. Just take a look at swimming, diving, gymnastics, and track and field events.
I'm now even more convinced that the naked body is the best competition getup for many sports. It is low friction, non restrictive, highly breathable, and very very light. Perfect!
The Greeks definitely knew something when they made the rules for the original Olympics!