Sorry this is so vague, I think this was a sci-fi story I read as a kid, maybe just a few pages long. The only detail I can remember clearly is the last line having something to do with wearing a knurled cap. (Which I know, isn't a hat.) That line just popped into my head and now it's stuck. I have an even vaguer idea that it's about a dead person (maybe in space?) who can come back to life if they can describe themself, but I have no idea if that's actually a real memory.
This is a very short story and matches your description quite well because it's about a recording of a dead human. The recording attempts but fails to describe itself:
I’m trying to rebuild my body. Why do my thoughts keep going out of focus? Help me, please!
That monstrosity? Is that what I told you I looked like? Erase it. We must start again.
The head, now. It is perfectly spherical, and weareth a runcible cap….
Too difficult. Begin somewhere else. Ah, I know—
The thighbone is connected to the shinbone. The shinbone is connected to the thighbone. The thighbone is connected to the shinbone. The shinbone…
All fading. Too late, too late. Something wrong with the playback. Thank you for trying. My name is… my name is…