Can a 13-year-old boy wear a bra?

Answer 1

Technically, yes.  But as a male wearing a bra is unusual and considered a taboo by some, don't expect that you will be respected and your choice tolerated by all.  You may attract ridicule, rejection and bullies as they "make fun of you".  If you want to wear a bra because you have giggly b*****s, wear a sports bra under thick or layered shirts so that your bra doesn't show.  If you want to wear a bra because you simply enjoy it, do it in the privacy of your home or when out wearing a coat or other non-revealing clothing.  Good luck.