Be the first one to do the same and you'll be surprised who will follow you next. I shared this here before where I, my cousin and some guys from the neighborhood were drinking. We were just flapping our shirts because it was hot. I was the one who took off my shirt off first and seconds later the rest of the guys followed.
@AAAmax I'm a follower, and rarely go shirtless in public other than the beach or pool. However, when I do take off my shirt, I appreciate the nod of approval I receive from another shirtless guy to show his support.