Meaning of the word "the cowl does not make the monk" in English

What does "the cowl does not make the monk" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the cowl does not make the monk

US /ðə kaʊl dʌz nɑːt meɪk ðə mʌŋk/
UK /ðə kaʊl dʌz nɒt meɪk ðə mʌŋk/
"the cowl does not make the monk" picture

Idiom

outward appearances can be misleading; a person's clothing or profession does not necessarily reflect their true character

Example:
He looks like a professional, but remember that the cowl does not make the monk.
Don't trust him just because he wears a suit; the cowl does not make the monk.