What happens to the person who wears bodhisattva guanyins cassock ?

"The cassock is a very powerful ornament created by heavenly immortals and is only meant to be worn by a true monk.

"If it is worn, all demons are extinguished;
When donned it sends all monsters down to hell.
It was made by the hands of heavenly Immortals,
And none but a true monk should dare put it on."