That's called projecting. If someone doesn't send a signal, but you believe you received it, that's on you, not them. You may _think_ the color of their skin or hair or the way they talk or dress or whatever "means/says something" (and, in some cases, it might) but it might just as well say something about you, not them.
You can call it whatever you want but people make inferences. Also there is no bright line between intentional and unintentional signaling. The brain is capable of hiding plenty of stuff from its own other parts. See the book "The elephant in the brain".
> You can call it whatever you want but people make inferences
This is an incorrect definition of a signal.
I agree that intention is irrelevant. But a powerful person blending in with their dress isn’t actually sending a signal. There is nothing to perceive because they look like everyone else.
The signal is only in if they’re recognized. Your definition of signal is congruous with any trait someone thinks a powerful person has whether it’s real or imagined.
If you dress down in a context where formal attire is expected, it's a signal. What it signals depends on what happens. If you're shunned and avoided, then you're just a loser or a hobo. If you're clearly valued, listened to with interest etc, despite that mismatch, it is a countersignal. You could only afford to do this by having high status and importance in the community that outweighs such expectations. It doesn't matter if you simply don't care and never think about how you dress and this just comes naturally. The signal is still picked. The person to whom general expectations and rules don't quite apply the same way as to the average person is the one of higher status.
In other words, it's not enough to flaunt the rules, you also have to get away with it for it to count.
Reminds me of how Nassim Taleb (famous for Black Swan among other books) says that he wants his surgeon to look like a butcher. The thinking goes that if despite all that roughness and sticking out, he’s a surgeon, he must be a pretty damned good surgeon.
> You can call it whatever you want but people make inferences.
This isn't about what it's called, it's about who's doing it. If people make inferences, that's something being done by the people making the inference, not by the people they are making the inferences about.
This is a pretty fundamental point, and grasping it is essential to having healthy interactions with others.