You may feel that clothing is boring and something you can look past, but you are in a tiny minority. By failing to invest a bit in your appearance you are foolishly forgoing substantial advantages in life.
In my life I bang on keys all the day long, and keys don't care what I wear. What could change?
The undertaker at the pet cemetery only buries dead animals, why would they care what he wears? The answer is because other people exist.
> I only interact with colleagues and I can't imagine them
> caring what I wear.
I'm comfortable at being more or less adequately dressed comparatively.