I swim in my underwear and I don't intend to stop.
Are you serious? Why do you prefer to swim in your underwear?
I don't see the need to get a separate bathing suit.
People are going to think you're weird for swimming in your underwear. It's not even hygienic. You shouldn't swim in underwear, that's what bathing suits are for.
If you don't like it then stay out of the swimming pool. It's as simple as that.
I'm just saying that it's not very healthy to swim in your underwear. There's a reason most people use swimsuits.