I Like to Go Shirtless

I like to go shirtless in my neighborhood and in the park near my home, but i still feel the need to take a safetyshirt with my. I´m still sometime chick out and put it back on although I would like to stay shirtless. Maybe this is, because it`s uncommon here in Hamburg (North-Germany) to walk around shirtless outside a park, the beach etc.) and my boss and some colleagues are living near my home.
This summer I walked to the park near my home, took off my shirt and walked around. after a while I got the Idea Icould try to be completely without a safetyshirt, hide it behind a tree and just walked completely without. It first felt a little bit strange not to have a safetyshirt, but after a while I liked it.
When it was about time to go home, I wasn`t able to find the tree and the safetyshirt again and so I had to got home without any shirt. I`ve walked there before too, but I had a safetyshirt. So it was somehow a new situation. I had to walk down a big street with shops, busses and a metro station and I felt exited and a little bit nervous, i could meet somebody I know, but it somehow really felt good. I hope next summer I will have the balls to go completely without the shirt.
Any tips to achieve this?