I'd be very thankful now if the system forced me to swim in what's the most natural, logic and rational clothe for swimming, back when I was at my secondary school. We had twice a week obligatory swimming lessons as the PE exercise (2 times in the pool and 2 times in the sport hall weekly). Not only was the swimming suits considered normal and required, but we even showered wrongly, I mean in trunks also. Both before as after swimming.
Now, the thing about showering was really inappropriate. They should have told us and force us to do it wisely to maintain the right hygiene. I even felt it's not really right back 10 years ago, but of course no one had enough courage to strip and wash himself properly.
But the bigger thing, about swimming naked, would be something I would perhaps understand many years later, but once I had, I would appreciate it a lot. I know it now. And due to the self-conciousness I was taught to be the only righteous way to act like, I think I've lost a few years of enjoying myself in the body I live in and not be ashamed of how it lookes! Now that the idea of being ashamed of my own body seems so very ridiculous, I regret not having this good mindset earlier.