To use an example: If I go to work wearing a nice shirt that is cleaned and ironed, signalling theory would say I'm showing I can afford nice clothes, and to keep them looking nice. But if I go to work wearing a worn out tee-shirt I got for free from a vendor, signalling theory would say I'm signalling tech worker group membership, and that I have a modern trendy employer, or even that I'm so confident in my skills that trivial matters like clothes are inconsequential.

Likewise, I travel to work by nice car? Signalling wealth. By economical car? Signalling good financial sense. By running or bicycle? Signalling fitness and free time. By public transport? Signalling virtue and environmentalism.

If no matter the input, signalling theory would say "aha, exactly as expected" then can signalling theory ever be disproven?