Offline Marketing Idea with a shirt?

Hey guys! Hope you're all doing well with your pursuits.

I am here to request some feedback on an offline traffic-getting strategy for my online venture. Weird, I know, but I will describe it right now.

I am writing a book on self growth and development. It's something I feel passionate about and if I can help others achieve the peak of their happiness by building themselves up, I can live happy. I feel as if the personal nature of my book warrants my strategy I want feedback on.

I attempted to sell another book online last year around this time and I failed miserably for 6 months, so I am looking to separate my second venture away from this as much as possible.

My offline strategy consists of:
-Buying a custom shirt with a headline that will catch people's interest in a public setting. I was thinking about having a CTA as a headline (Ex: "Ask me about X") to catch their attention, the headline being relevant to promoting my book
-I would have this shirt on in social settings such as the mall, shopping centers, restaurants, etc., anything that embaces a social vibe between people.
-Using the knowledge I learned about social dynamics and influence principles, I think I can honestly chat up some people in a friendly matter, perhaps making new friends.

Why I think this might work:
1. If I have a CTA as the headline on my shirt, it's a screening line to see if people are entrieved enough to ask me about my book, so the frame isn't "me coming to them" but "them coming to me", having a better frame to build a connection. I was in an Uber with a driver today and he started to naturally ask what I do and I replied that I was making a book and we were honestly building great rapport. I honestly think had my book been all finished up, I could have had my first client.
2. Judging by the skils I already have regarding social skills, I think I can build a significant amount of connections that would be interested in my book. A friendly undertone and connection I think would provide the same advantage as someone online who makes sales from warm leads instead of cold leads.
3. The interaction is in person and as we all know, the personal the connection is with your client, the better.
4. I feel if I do this and get results at the beginning, the social dynamics will only be more effective, having a snowball effect. People actually see people stopping me to ask about my shirt and we could hit off from there, maybe lead into having a lunch at the mall/shopping center etc (Social proof basically).

Thanks guys. All constructive feedback is appreciated.