Is it normal to wear underwear while swimming?
Depends.It depends
Some people wear underwear while swimming, but it’s not the usual choice. Regular underwear can get heavy and uncomfortable when wet, so swimwear is generally better.
It happens—sometimes for modesty, comfort, or because you don’t have a swimsuit handy. But regular underwear isn’t designed for swimming: it can hold onto water, sag, chafe, or become see-through, and pool rules may require proper swimwear.
If you mean wearing underwear underneath a swimsuit, most people skip it; swimsuits are made to be worn on their own, and an extra wet layer can feel uncomfortable. If you’re after more coverage, swim shorts or a lined swimsuit are usually a better bet.