A PTSD impaired veteran lives as a rag artist. One day he picks up a mysterious nano-tech shirt which super-heroes him. In the author’s words it is kind of bootstrapping humanity. I don’t know if that word makes any sense to non-computer nerds, though.
I thought of Chackie Chan’s comedy-action movie „The Tuxedo“, although this one doesn’t enhance the protagonist physically but mentally.
The story is a bit chaotic, maybe resembling the protagonist’s mental state. For example, it briefly mentions synesthesia but doesn’t dive into it, similar to a short attention-span.
And I think the outcome is a bit weak considering and potential the story had with it’s good start.