It was 1981, the summer before my freshmen year at college. I was in London and decided to go out to the venerable Crystal Palace sports center which I'd heard so much about, to run a workout, 10,000 on the track. It was warm as heck but everyone had shirts on. Figuring maybe the Brits had rules for this sort of thing, I inquired of a local if I could take my shirt off to run the workout. He responded with: You aren't a woman are you? That was that. I pr'd.
God bless the [late] British Empire.
This has been going on for years. In the early 80's a city tried to ban running without a shirt.
Golf courses also do this. In high school my buddy and I played a round of golf and it was about 90 degrees. We didn't have to wear a shirt playing but couldn't go into the clubhouse to get a can of pop. I cut holes in a paperbag (the old kind you used to get at the supermarket) and put it on to go inside. Got a big laugh. Luckily I was skinny enough to wear it.
Just go down to the local "mens club" and get some pasties to wear when you are out running. That has to make it legal doesn't it?