I've seen shirts blow open in the wind and some folks would say; So what??
Another option is a summer weight "travel vest" where you san put a reasonable amount to "tuff" in the side shirts and keep the vest open. You can still wear a light button shirt or T-shirt. You won't print and "Flashing" would be minimal. ……
Hey, try it and you might just like it. …….
Be Safe !!!