Fly Racing Flux Air Mesh Textile Motorcycle Jacket Hi Vis Black Choose Size | eBay
It's not a "shirt" like you were asking but is plenty cool to ride in, even on a hot day, long as you are moving, lets air in all over everywhere. Also comes with a zip-in liner that would give you wind/rain protection on a chilly or wet day. The armor is removable and upgradable. I got a 3XL and it fits me beautifully. I love it.