It is also suggested that boys wear swimsuits when swimming, which looks better.
With the development of time, I think boys will wear sexy underwear more and more.
After all, girls with flat chests are everywhere. Just choose your own size, small cups, and some sports bras of various sizes. Boys may not buckle their backs, so they should buy some breastplates to wear. Some boys who run marathons also need to wear chest stickers.