Can a young boy wear a underbust corset?

Of course a young boy can wear a corset. Anybody can wear anything they want. Be prepared for a variety of reactions however, and they all won't be positive. Follow the measuring instructions on the website where you're ordering the corset. They are almost always adjustable so you can wear them as tight or as loose as you want. Keep in mind that your ribcage will stay the same so that measurement is crucial to getting the correct size. Good luck!! : /